Tag Archives: featured object

Object of the Month – June 2023

This is the cast skin / exoskeleton (exuvia) of a dragonfly larva, found in Elsenham in August 2005. The shape of the eyes and the length (40mm) suggest it’s a hawker dragonfly, while the finder’s description of the adult dragonfly being green and yellow means it is probably a southern hawker, which are common in July and August.

Dragonfly exuvia © Saffron Walden Museum

These dragonflies spend 2 or 3 years as a larva, or nymph, living underwater, before coming above water to shed their skin and emerge as an adult.

Southern hawker dragonfly by Tom Wiersma, via Wikimedia Commons.

Dragonflies, like all insects, have a hard exoskeleton which does not grow with them. After hatching from an egg, dragonfly nymphs gradually grow into adults through a series of moults to shed their skin, which allows it to grow in size each time, emerging as an adult directly from the last moult.
The nymphs look similar to the adult, with a long body and six legs. Nymphs in the last stages of growth have wing buds that you can see on this specimen.
This method of growth, through nymphs with wings developing on the outside, is called incomplete metamorphosis.

This is different from other insects including flies and butterflies, which hatch as maggots or caterpillars. This is the larva of the insect, and it looks very different from the adult. The larva in these insects also has to moult to increase in size, but the final moult is different. It creates an inactive pupa (called a chrysalis in butterflies) where the final radical transformation into the adult takes place. This method of growth from larva to pupa to adult is called complete metamorphosis.

Visit the Museum to learn more about the two types of metamorphosis in the Discovery Centre, and take a closer look at two exuviae from our Malaysian stick insects.

Exuvia of female Malaysian stick insect © Saffron Walden Museum

Exuvia of male Malaysian stick insect © Saffron Walden Museum

 

 

 

 

 

 

 

Image credit:
Female Southern Hawker – Tom Wiersma, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0>, via Wikimedia Commons. Accessed 25.5.2023.

 

 

Identification – deer calcaneus

It looks like a calcaneus bone, which in humans and other primates is the heel bone of the foot. This one is from a left leg. In most non-human mammals it looks like it’s halfway up the hind leg, but serves the same purpose as the attachment point of the calf muscles (gastrocnemius and soleus), and its length acts as a lever to make the muscle action more powerful when flexing the foot towards the ground.

Black background with a tape measure vertical, centre-left and a bone vertical, centre-right. the bone is wider top than bottom, with points at top and top left.

Mystery bone © S Moore

As a tentative ID from reseraching from my desk in the UK  is white-tailed deer (Odocoileus virginianus), based mainly on its size and coming from Mississippi. The bone is a bit worn so some of the sharper and edges and points are missing, but the overall shape of the wide end looks like it matches the photos here https://www.boneid.net/search/?product_cat=wt_deer&pa_anatomic-elements=calcaneus&order=DESC. The length is about right too, if you imagine adding back on the points and edges that have been worn away.

For much more information on the calcaneus bone, see this ID of a cattle calcaneus Identification – cattle hock bone

Identification – Fossil sponge in flint

Some flints do contain fossils, or look like whole fossils. Fossils inside the flints are often sea urchins, or cockles or other small shellfish. Sometimes, the whole flint looks like fossil, and this may be because the silica that created it was forced into a hollow space in the hardening chalk filled by a sponge. The silica fills the gaps in the sponge’s skeleton, and over millions of years, the skeleton itself can dissolve away and be replaced by other minerals. This skeleton is a fossil, and the flint fills the spaces left by the soft parts of the animal after they rotted away.

A grey, funnel-shaped fossil on a wooden surface

Typical funnel-shaped sponge, fossilised in flint. © L Hodgson.

The shape of this piece of flint looks a lot like a small sponge that lived on the sea floor, and was fossilised in flint as the thick mud solidified into chalk. It may have patterns inside it that show the structure of the sponge’s skeleton. The wiggly line around the widest part of the flint shows the top rim of the sponge and the rough texture of the line is the surface texture of the sponge preserved as a fossil.

More info on flint and chalk in Essex in this post from 2020. https://saffronwaldenmuseum.swmuseumsoc.org.uk/identification-flint-fossil-sponge/

Object of the Month – October 2022 – Alpine Swift

Dark alpine swift (Tachymarptis melba) on a white perch

This month we’re celebrating the Lost Language of Nature project, with repair work to this alpine swift. This bird has been cleaned and had its base refreshed to help preserve it for future exhibitions, and will be on temporary display in the Museum throughout October. Alpine swifts spend the warmer months around the Mediterranean Sea and further east, or in southern Africa, and spend the cooler months in parts of east and west Africa. This one was found or killed in Hinxton, Cambridgeshire, in 1832. They are related to the common swifts we see in Britain but are noticeably bigger. Old beliefs about swifts said that they had no feet, and the scientific name of the common swift and related birds – including the alpine swift and hummingbirds – even comes from the Ancient Greek for ‘without feet’.

We’d love to hear your stories about wildlife and nature in your life – rhymes, songs, saying, or names for plants and animals that you know from parents or grandparents. Fill in one of our special postcards in the museum, or click here.

Anyone and everyone has a story to tell, and your stories will help us create more interesting and relevant displays for everyone who comes to the museum in the future.

Dark alpine swift (Tachymarptis melba) on a white perch

Alpine swift after conservation work

Swift work

This alpine swift is 184 years old and needed a good clean with special smoke sponge to remove dust and dirt from its feathers. Conservation work like this is always done very carefully, trying to avoid harmful chemicals, and using techniques that can be easily reversed if needed.
We cleaned its glass eyes with rubbing alcohol (isopropyl alcohol) and a hand-made cotton swab. The dust and dirt on the feathers can allow mould to grow, which damages the feathers because it produces acidic waste products. This bird had some possible mould patches underneath its tail and on top of its right wing, which we also cleaned with rubbing alcohol to kill and remove the mould.

We removed the swift from its base to paint the base white – you can see green splashes on the bird’s feet where the base was painted green in the 1930s without removing it. Birds are attached to their stands using wires from the bottom of the feet, and we had to cut one to remove the base.

Underside of bird with feet upwards. Wire protruding from foot on left of picture.

Alpine swift removed from perch, wire on right foot cut.

A new wire then needed attaching so the bird could be put back on its perch. We wound green florist’s green wire around the cut wire underneath the swift’s foot, and secured the new wire to its leg using Japanese tissue paper and conservation-grade PVA glue like tiny papier-mâché.

Underside of bird with feet upwards. New wire protruding from foot incentre of picture.

Alpine swift removed from perch, new wire on left foot.

Object of the Month – June 2022

June’s object of the month celebrates the Lost Language of Nature project, with repair work to this hen harrier. With Lost Language of Nature, we want to hear your stories about wildlife and nature in your life, or rhymes, songs and sayings for all kinds of animals that you might have heard from parents or grandparents. For example, different old names across the country for hen harriers include Blue sleeves, Vuzz kitt, Grey gled, Furze kite and Goss harrier; or Ringtail for females, like this fragile mounted skin. Head to our website for more information https://www.swmuseumlearning.com/the-lost-language-project

This bird came to the Museum in the 1800s, and was taken from the area around Saffron Walden. Today, hen harriers only live in the north of England, north Wales, in Scotland and on Scottish islands, including Arran and Orkney.

Hen harrier on temporary base during conservation work.

Hen harriers today

Hen harriers are one of the UK’s most endangered birds of prey, with only an estimated 545 breeding pairs left in the country. They are on the RSPB’s Red List of endangered species in Britain, but listed as ‘Least Concern’ globally by the International Union for Conservation of Nature.

Work carried out by the RSPB suggests that over 2,500 pairs could survive in the UK. They live in open areas with low vegetation, like heather moors.

Between 2014 and 2019, the RSPB ran the LIFE project to learn more about hen harriers in Britain, their movements throughout the year and to understand why their numbers are so low. They tagged over 100 birds that they tracked using satellites, and found that some fly 1000 miles to spend the winter in Spain and Portugal. Not all birds do this though – the brother of one of these wandering birds always stayed within 50 miles of where he hatched.

In the UK, hen harriers are protected under Schedule 1 of the Wildlife and Countryside Act, meaning it is illegal to kill, injure or capture the birds, their eggs or nests, or even disturb the birds and their young while they are nesting. Despite this, the study showed that the numbers of breeding hen harriers fell by 24% (about one-quarter) between 2004 and 2016. In particular, the project monitored seven Special Protected Areas in parts of the country where land is managed for driven grouse shooting. In these seven areas, hen harrier numbers fell by over 80%, which suggests that there is deliberate human action to reduce their numbers in these areas.

References

https://www.rspb.org.uk/birds-and-wildlife/wildlife-guides/bird-a-z/hen-harrier/

https://www.rspb.org.uk/our-work/conservation/projects/hen-harrier-life/about-the-project/

https://community.rspb.org.uk/ourwork/skydancer/b/skydancer

https://community.rspb.org.uk/ourwork/skydancer/b/skydancer/posts/hen-harrier-apollo-bomber-migrate-1000-miles-to-spain

https://www.rspb.org.uk/our-work/conservation/projects/hen-harrier-life/best-places-to-see-hen-harriersnew-page/

Identification – Sea urchin fossil

Did you know we identify items for free? Whether it’s a rock from a field or a mystery something from the back of the shed, just bring it in to the Museum and we’ll take care of the rest! (If it’s too big or heavy, just send us an email with a photo).

This piece of flint with a strange marking on it was found in Wethersfield, near Braintree.

The flint nodule has preserved the impression of part of a sea urchin, or echinoid (pronounced ek-in-oid).

The shape you see is the external mould of a single plate of the echinoid’s ‘test’, or shell. When a sea urchin dies or is eaten, the test will often break apart into the individual plates.
Flint is formed from a silica-rich goo which hardens over time, and must have formed on top of this echinoid plate and taken its shape. The plates are made from calcium carbonate and this one will have dissolved away over time, leaving the impression behind.

The shape of the plate suggests it belongs to a species in the genus Cidaris. Saffron Walden Museum has a similar echinoid, Stereocidaris sceptrifera, fossilised in chalk, on display as no. 23 in the How Did They Live display in the geology gallery (below, top). In life, the club-like spines would have been attached to the plates. One of the Museum’s volunteers took this photo of a similar echinoid found at a chalk pit in Grays, Essex (below, bottom).

Fossil in chalk of the extinct sea urchin Stereocidaris sceptrifera, on display in the Museum’s geology gallery. SAFWM : 2020.42.23

The plate in the flint nodule (and the plates in the photos) is an interambulacral plate, which make up most the test of a sea urchin. They fill the space between the ambulacral zones, which are the areas where the urchin’s tube feet pass through the test. Tube feet are used for movement and to exchange oxygen and carbon dioxide with the water for respiration. Sea urchins have 5 ambulacra arranged in a star shape, showing that they are related to starfish.

The Natural History Museum has a good page showing the structure of a sea urchin test: https://www.nhm.ac.uk/our-science/data/echinoid-directory/morphology/regulars/intro.html

The British Geological Survey has an interesting page with good photos of similar fossil echinoids – look out for Temnocidaris (Stereocidaris) sceptrifera about halfway down, and Heterocidaris wickense at the bottom: https://www.bgs.ac.uk/discovering-geology/fossils-and-geological-time/echinoids/

Another link to the NHM with photos of Stereocidaris fossils: https://www.nhm.ac.uk/our-science/data/echinoid-directory/taxa/taxon.jsp?id=1115

 

 

 

Object of the Month – February 2022

February’s Objects of the Month are minerals with connections to love and relationships, in honour of St Valentine’s Day on 14 February.

4 mineral specimens on a white background. Lines of shade cross the image.

Amethyst geode (top left), sapphire (bottom left), ruby crystals in sheet of mica (middle), lapis lazuli (right).

Amethyst is the birthstone for February, but as a symbol of love, St Valentine is said to have worn an amethyst ring so Christian couples in Ancient Rome could identify him. Valentine was a priest who carried out forbidden Christian marriages and married young couples, when the Roman empire persecuted Christians and preferred their soldiers to be unmarried men.

Lapis lazuli can represent truth and friendship, and in Christianity represents the Virgin Mary. With the blue of the sky and gold of the sun, it represents success in Jewish traditions, while beads found in the ancient town of Bhirrana from 7500 BCE are its oldest known use by people. The remains of Bhirrana are in the Indian state of Haryana.

The deep red colour of high-quality rubies means it is associated with love and passion in modern societies. Throughout history it has been popular in Burma (Myanmar), Hindu culture and China as a protective gem in battle or to secure good fortune when put beneath a building’s foundations. In the UK, it is the traditional gift for a 40th wedding anniversary.

Sapphires are popular for engagement rings, as used for Lady Diana’s engagement ring from Prince Charles. Sapphire is the traditional gift in the UK for a 45th wedding anniversary and can symbolise truth and faithfulness. Ruby and sapphire are actually the same mineral (corundum), with different colours depending on small amounts of other metal atoms included in the crystal. Chromium makes the ruby red, while blue sapphires are coloured by iron and titanium.

Object of the Month – June 2021

A humpback whale leaping out of the sea. One flipper visible pointing left.

Humpback whale photographs taken by Barry Kaufmann-Wright in New Zealand, in 2013.

BK-W © Saffron Walden Museum

Image 1 of 5

BK-W © Saffron Walden Museum

All Images BK-W © Saffron Walden Museum

Barry took and kept over 72,000 photographs in his lifetime, almost all of wildlife and the countryside. Barry grew up in Buckinghamshire but his first job was at Jersey Zoo, working for the famous naturalist Gerald Durrell.
When he returned to the UK, Barry joined Essex police and was posted to Thaxted, where he began duties as Wildlife Crime Officer and, later, Wildlife Liaison Coordinator for Essex. His photographs from all over the world are a modern treasure in the Museum’s collection, which also includes two slide projectors which he used when giving talks – up to 250 times a year (that’s 5 per week)!
Barry’s wife Pat very kindly donated his photographs and equipment following his death in 2016.

Humpback whales live in oceans all over the world, except the far north of the Arctic Ocean and around Antarctica in the Southern Ocean, where the sea is covered in ice. Whales are mammals, so sea ice stops them coming to the surface to breathe air.
They are grouped into four major populations in the north Pacific Ocean, Atlantic Ocean, Southern Ocean and Indian Ocean. They usually migrate between summer and winter ranges, but there are year-round groups around Britain and Norway, and in the Arabian Sea between India and east Africa.

– They can grow up to 16 metres long
Humpbacks are one of the largest whale species. Females are slightly larger than males, usually up to 16m (50ft) long. They can weigh 30 tonnes – the same as 2½ double-decker buses.

This picture shows the size of a humpback whale compared to a human swimming next to it, and its long pectoral fins. Image: Jjw, CC BY-SA 4.0 via Wikimedia Commons

– They have ‘big wings’
The scientific name of the humpback whale, Megaptera novaeangliae, means ‘big wing of New England’. Their ‘big wings’ are their giant pectoral fins – one female had fins that were 6m (20ft) long, as tall as a giraffe!
The ‘New England’ part comes from where humpback whales were first discovered by European whalers, off the coast of New England in the far north-east of the USA.

– Each animal’s tail is unique
A whale’s tail is called a fluke, and has a wavy pattern along the rear edge. Like our fingerprints, this wavy pattern is unique to each whale and is an easy way to identify animals in a group.
Compare this image to Barry Kaufmann-Wright’s photograph of a humpback’s fluke, above.

Image: Terry Howard CC BY-SA 3.0 via Wikimedia Commons

– They use nets to catch fish
Humpbacks migrate between summer and winter ranges and only eat for 6 months of the year, in the cooler waters of their summer range. Hunting and eating for 22 hours a day means they can build up enough fat reserves to survive their winter breeding season without eating.
Some populations of humpbacks have learned to feed in groups using the ‘bubble net’ technique and use vocal calls to work together. The whales swim in circles below a school of fish, blowing bubbles from their blowholes to create a ‘net’ that the fish won’t swim through. When one whale gives a feeding call, all the whales swim upwards inside the net with their mouths open to catch the fish.

A humpback whale using the bubble net technique on its own. Image: Christin Khan, NOAA/NEFSC, Public domain, via Wikimedia Commons.

– They sieve their food
Humpbacks are one of a group of whale species called baleen whales, which have bony, comb-like plates inside their mouths. With a mouth full of water and food animals, baleen whales partly close their mouths, and push water out through the baleen plates using their tongue. The baleen lets the water through but keeps in food such as fish and krill, which the whale then swallows.

Baleen plates and bristles in the mouth of a young gray whale. Image: Marc Webber/USFWS, Public domain, via Wikimedia Commons

Whale ear bone, probably from  North Pacific right whale (Eubalaena japonica)

The North Pacific right whale is a baleen whale like the humpback.
This bone is the tympanic bulla and may have come from a North Pacific right whale. It’s a hollow shape but made of heavy, dense bone which helps sound resonate in the whale’s middle ear, inside the head. In life, it would have been attached to the petrosal bone, which has snapped off.

Smaller bones called the hammer, anvil and stirrup would sit inside the hollow space, and actually transmit the sound from the outer inner to the inner ear, just like in humans.

The North pacific right whale got its name because it is a large whale (up to 18m long but weighing 80 tons) with plenty of valuable blubber, it moved slowly, and would float after it was killed. It was the ‘right’ whale to go for because it was easy to catch and made lots of money for the whalers.

Image: John Durban (NOAA), Public domain, via Wikimedia Commons

More than 15,000 were killed by whalers in the 19th and 20th centuries. Today, estimates say there are fewer than 400 North Pacific right whales left, split between an eastern and a western population, making them the smallest known population of all whale species, As a whole, they are listed as Endangered on the IUCN red list, while the eastern population is Critically Endangered, with less than 40 animals.

Use this link to listen to a song about the dangers of whaling, based on the songwriter’s own experiences in Australia in the 1950s – www.swmuseumlearning.com/general-5

Object of the Month – February 2021

Water voles are probably best known from the character ‘Ratty’ from The Wind in the Willows. Recently described as “Britain’s fastest, declining mammal”, they are making a comeback thanks to careful wildlife management and the return of a locally extinct predator – the polecat.

Water vole © Saffron Walden Museum.

Water voles are about the same size as a brown rat, but with a furry, much shorter tail, and small ears. Today, they are a semi-aquatic mammal, relying heavily on streams and rivers for food and shelter – they use their teeth to dig burrows into steep banks to shelter and raise their young.

Do water voles need water?

But it wasn’t always this way. They don’t show any of the usual adaptations for a water-based mammal, such as webbed feet and a ‘keeled’ tail (flattened sideways but taller top-to-bottom), both of which make otters very strong swimmers.
In the 1500s, rewards for hunting ‘rats’ may actually have referred to ‘water voles’ that lived entirely on land. Their burrowing habits and herbivorous diet would have made them an agricultural pest, which would explain the rewards paid for hunting them. Modern water voles are always found on waterways, so any hunting must have succeeded in wiping out fully-terrestrial water voles.

A population vole-ercoaster

In the 1990s and early 2000s, the number of water voles in the UK plummeted, making them Britain’s fastest-declining mammal. Surveys of water vole territories in Essex showed that  81% of recent territories were still occupied in 1990, but by 2005, only 7.5% of territories were still occupied in certain areas.
Such a drastic decline couldn’t just be down to habitat loss, and they are resistant to pollution – water vole colonies live in the banks of streams which run from landfill sites along the Thames estuary, and on rubbish-choked streams near Rainham.

Studies by Essex Wildlife Trust showed that crashes in water vole numbers closely followed local increases in the number the invasive American mink. These animals are not native to the UK, and became established after escaping or being released from fur farms from the 1950s onwards. Mink will hunt water voles in their burrows and in water, and a female can destroy a water vole colony in one breeding season. The water vole’s usual predators only hunt on land, and are too big to fit in their burrows.

American mink. © Saffron Walden Museum.

Essex Wildlife Trust began work in 2007 to control mink numbers in key water vole strongholds, allowing water voles to recover, and spread. In 2012, more areas were put under mink control, and water vole colonies were relocated from sites destroyed by development along the Thames and M25. Surveys in 2013 showed that these colonies had survived and spread, with several new colonies established along the river Colne and its tributaries.

Ratty’s new best friends

Since 2000, wildlife surveys have found an ever-increasing number of polecats, a native predator which had been extinct in Essex for over 100 years. Polecats were hunted to near extinction across the UK by gamekeepers, who treated them as dangerous vermin, and they were also easily caught and killed in rabbit traps, which fell out of use in the 1950s. Polecats have probably spread into Essex from a targeted release in Hertfordshire in 1982-3.

Natural Sciences Officer, James Lumbard, with the skin of a recenltly-mounted polecat. The polecat was brought to the Museum after being found dead at the roadside. Image © Saffron Walden Museum.

Otter © Saffron Waledn Museum. This otter is on view in the Victorian Museum Workroom display when the Musuem is open.

Informal tracking and recording also suggests that the return of polecats may be helping water voles spread and recover more quickly, by reducing mink numbers. The same is true for otters, which are now returning to Essex, after being declared locally extinct in 1986. Both of these animals are native predators that rarely hunt water voles, but will compete with the American mink for food and territory, and are also big enough to hunt or kill mink. There are no studies to confirm it yet, but it could be very good news for water voles, and wildlife-lovers across Essex.

References

Are the otter and ​polecat combining to reduce mink numbers? East Anglian Daily Times, first published 31 March, 2019. Accessed 29.1.2021: https://www.eadt.co.uk/news/business/rise-in-polecats-and-otters-hit-mink-2562736

Mammals of Essex by John Dobson and Darren Tansley, 2014.

Object of the Month – October 2020

New Zealand Kiwi

We’ve been busy over the last few weeks moving the bird taxidermy from a temporary home back to their usual store. October’s object of the month is a mounted kiwi skin, probably of a little spotted kiwi (Apteryx owenii), the smallest of the five kiwi species.

A stuffed Little spotted kiwi sking, facing left, mounted on a 'naturalistic' base.

The little spotted kiwi in Saffron Walden Museum. © SWM

With strong, heavy legs and no wings, kiwis have evolved for life on the ground. They are nocturnal, dig burrows to nest in, and have stiff, hair-like outer feathers to withstand pushing through leaves and twigs. Unlike most birds they have keen hearing and a good sense of smell to help them find food, mostly earthworms and insects.

A page from a book with drawings showing the head, wing and strong feet of a kiwi.

Kiwis have ‘whiskers’ around their beak, stiff feathers and tiny wings, and strong feet for digging.
[Internet Archive Book Images / No restrictions]

Kiwi numbers have plummeted since Europeans arrived in New Zealand, bringing rats, stoats, pigs, cats, dogs, trophy hunting and habitat destruction. Kiwis grow and reproduce slowly and only thrive today on protected reserves, with intensive work to remove these threats. The indigenous Maori regard the kiwi as a taonga (treasure), and actively protect the birds across 230,000 hectares of land, about the same area as the national government’s Department of Conservation. Altogether, an area of land bigger than Essex is managed for kiwi conservation.

Coloured map of New Zealand showing distribution of kiwis at present day and before European colonisation.

Light green, current location of kiwis; Dark green, location of kiwis before European colonisation; Dark grey, kiwis never known here. [© New Zealand Department of Conservation]

Map with numbers and letters showing locations of Little spotted kiwi populations across New Zealand.

Little spotted kiwi reserves – Predator-free islands: 1, Hen Island; 2, Tiritiri Matangi; 3. Red Mercury Island; 4, Motuihe Island; 5, Kapiti Island; 6, Long Island; 7, Anchor Island; 8, Chalky Island
Mainland: A, Shakespear Open Sanctuary; B, Cape Sanctuary; C, Zealandia.
Michal Klajban / CC BY-SA 4.0

See the little spotted kiwi and find out more about kiwi species in our Object of the Month display when the museum re-opens soon.

More information
New Zealand Department of Conservation (DoC) –  Facts about kiwi: https://www.doc.govt.nz/nature/native-animals/birds/birds-a-z/kiwi/facts/
New Zealand DoC – Little Spotted Kiwi: https://www.doc.govt.nz/nature/native-animals/birds/birds-a-z/kiwi/little-spotted-kiwi/
New Zealand DoC – Kiwi: https://www.doc.govt.nz/nature/native-animals/birds/birds-a-z/kiwi/
Science Learning Hub – Conserving our native kiwi: https://www.sciencelearn.org.nz/resources/2784-conserving-our-native-kiwi
WWF New Zealand – Kiwi: https://www.wwf.org.nz/what_we_do/species/kiwi/

References

Internet Archive Book Images. ‘Features of kiwis’ Transactions and proceedings of the New Zealand Institute (1870). Internet Archive Book Images / No restrictions. Available from commons.wikimedia.org [Accessed 29.9.2020]

Michal Klajban. ‘Apteryx owenii – distribution map. CC BY-SA (https://creativecommons.org/licenses/by-sa/4.0). Available from commons.wikimedia.org [Accessed 29.2.2020]

New Zealand Department of Conservation. Kiwi Recovery Plan Summary Document 2018-2028. New Zealand Government, 2018. Available from https://www.doc.govt.nz/nature/native-animals/birds/birds-a-z/kiwi/docs-work/ [Accessed 29.9.2020]