Tag Archives: object of the month

Object of the Month – October 2019

This case is arranged to show which butterflies live in the Saffron Walden area today (left), and which are extinct (right).

These butterflies died off mainly because of changing land use in the 19th & 20th centuries. Butterflies such as the Adonis blue (1) and chalk-hill blue (2) prefer large areas of chalk wildflower meadow, grazed by sheep and cattle. However, much of this land was converted to crop farming in the 1800s and these specialist insects died off. Other changes, such as the end of coppicing in woodlands, removed the open wooded habitat that butterflies such as the grizzled skipper (3) thrive in.

Species like the purple emperor (4) and white admiral (5) feed on the sugary waste products from aphids (honeydew). Pollution from coal burning may have contributed to these butterflies’ extinction as the toxins could dissolve into the honeydew on the leaf surface.

However, 2019 has been a very good year for some impressive larger butterflies too, with lots of painted ladies (6) arriving in Britain from the Mediterranean as they migrate north. Protected roadside verges in Uttlesford also provide good chalk grassland habitat for species such as the small copper (7).

There is also some very good news for three ‘extinct’ species (green boxes in main image). The purple emperor (4) returned to Uttlesford about two years ago and has been seen in Shadwell Wood and Rowney Wood, two local Essex Wildlife Trust nature reserves. The silver-washed fritillary (8) was first seen again about five years ago and is now known from Shadwell Wood, Rowney Wood and Hatfield Forest. The marbled white (9) has also been spotted at Harrison Sayer and Noakes Grove nature reserves and along some protected roadside verges over the last two years. The return of these three species in protected areas of countryside and special habitats show just how important effective conservation efforts are in supporting our native wildlife.

You can learn more about how humans have affected local environments and wildlife, for bad and for good, in the Take Away the Walls exhibition until 3 November.
Find out how you can help local wildlife groups on the Discovery Centre noticeboard next to the stick insects, and in the Take Away the Walls exhibition.

 

 

Object of the Month – June 2019

Did You Know?

The ‘cabbage white’ butterfly is actually two closely related species – the large white (Pieris brassicae) and the small white (Pieris rapae). Apart from the size difference, the large white has darker black wing spots, and a dark black band at the front of its wings. Both lay their eggs on cabbages in gardens, allotments and farms, as it is the preferred food of their caterpillars. The large white takes the outer leaves, while the small white prefers the soft inner leaves. The adult (imago) of both species often feeds on nectar from buddleia flowers.

Cabbage white butterflies “Insects Injurious to Vegetables”. SAFWM : 118007. © Saffron Walden Museum

The display has a male and female of each species, with the male at the top and female below. There is also a caterpillar of the large white butterfly, which is yellow and hairy, with black bumps on its skin. The small white’s caterpillar is pale green and hairless with a narrow yellow stripe on either side. The cabbage leaf in the box has some caterpillar feeding damage.

Caterpillar of the small white. CC BY-SA 3.0, Harald Süpfle.

Chrysalis of the small white. CC BY-SA 2.5, James Lindsey at Ecology of Commanster.

Life cycle

These butterflies have two ‘broods’ per year, and three in a good year. In the spring, butterflies which survived the winter as a chrysalis emerge as adults in April and May. They lay eggs in May and June (spring brood), which hatch into caterpillars in June and July. The caterpillars feed and grow quickly, and shed their skin 4 times as they grow. After about a month, the caterpillar finds a sheltered spot to transform into a butterfly in a process called metamorphosis. The caterpillar spins a pad of silk against the surface of its shelter, and sheds it skin again to reveal a hard skin (chrysalis), which has a small hook to keep it attached to the silk.

Adults emerge from the chrysalis about two weeks later, in July and August. They then lay eggs which develop into caterpillars through September and form chrysalises into October. The caterpillars go through a very slow metamorphosis to survive the winter, and emerge as adults the following April and May to start the process again.

Butterfly survival

On the right of the leaf are some cocoons and adults of a parasitic wasp which lays its eggs inside the caterpillars. After hatching, the wasp larvae feed on the caterpillar and eventually kill it, helping to control cabbage white numbers in a natural way. The adult wasp feeds on nectar.

The parasitic wasp, now called Cotesia glomerata. © Albert de Wilde.

Like many insects, these butterflies have declined in number recently. Currently, the large white and small white are not the focus of conservation efforts, but many other more specialist butterflies have declined severely or have gone extinct in Essex since 1900.
You can find out more about local butterflies in the Take Away the Walls exhibition at the Museum.

June’s Object of the Month was chosen by James Lumbard, Natural Sciences Officer.

Image credits

Pieris rapae caterpillar: James Lindsey at Ecology of Commanster [CC BY-SA 2.5 (https://creativecommons.org/licenses/by-sa/2.5)]. Accessed 11/06/2019.

Pieris rapae chrysalis: Harald Süpfle [CC BY-SA 3.0 (https://creativecommons.org/licenses/by-sa/3.0)]. Accessed 11/06/2019

Parasitic wasp Cotesia glomerata: Copyright © Albert de Wilde – All rights reserved http://www.ahw.me/img/sluipwesp4mm_grootkoolwitje01b.html. Accessed 11/06/2019.

Featured Image – Cabbage whites “Insects Injurious to Vegetables” on display in the Museum © Saffron Walden Museum

 

Object of the Month – April 2019

April’s Objects of the Month have been selected by Jenny Oxley, Collections Officer (Human History). She developed an interest in Napoleonic Prisoner of War items whilst working on the Norman Cross collections at Peterborough Museum in 2005. 

During the Napoleonic Wars (1803-1815) over 100,000 French prisoners of war (POWs) were held captive in Britain.  Many remained captive for the whole duration of the conflict.

The existing land prisons on the South Coast and at Norman Cross (Peterborough) were insufficient to house them all, so extra land prisons were built. Decommissioned naval vessels known as “hulks” were also used, with over 50 in operation by the end of the conflict.  Medical inspectors from the Transport Board visited and reported to Parliament on the state of the hulks and prisons, with contractors and staff reprimanded and in a handful of cases dismissed for providing substandard services. 

The standard daily ration for prisoners was: “half a pound of bread and half a pound of beef supplemented with barley, onions and cabbage or turnips; twice a week the meat was replaced with herring and cod.”

The luckiest of the POWs were probably those who were paroled officers. They were given a tiny allowance and had to live within the bounds of a designated parole town, but they were free to socialise with the local community.  Many prisoners whiled away their days making craft items to sell or teaching the locals French, Latin, Drawing, Music, Dancing and Fencing.       

On display in the Museum throughout April as Objects of the Month will be examples of craft items made by French POWs, including intricately carved bone models and examples of straw-plaiting and marquetry.

The polecat comeback

Object of the Month – February 2019

The European polecat, Mustela putorius, was thought to be extinct in Essex since 1880 thanks to persecution from gamekeepers. The first modern sighting was in 1999 near Wendens Ambo and there are now numerous records from north-west Essex, though only from roadkill specimens.

A mounted polecat skin from 1842 and a polecat skull, also from the 1800s.

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Object of the Month – October 2018

October’s Object of the Month is a Roman wine strainer chosen by Carolyn Wingfield, Curator

An Essential Accessory for Wine Drinkers

This fragile bronze vessel was described as a “Roman Bronze colander – origin unknown” in the Museum’s registers when it was acquired in 1927. It was among a list of diverse archaeological, historical and ethnographic objects given by George Morris of The Friends’ School, Saffron Walden. It measures nearly 15cms in diameter and the tiny holes piercing the central bowl form a delicate pattern.

Too delicate to be a colander, it is more accurately described as a wine strainer, which would have been used to filter sediment from wine. It is of fine workmanship, though a little damaged and has in the past been repaired with plastic mesh to support the paper-thin edges where some pieces are missing. The handle is also largely missing, although the end adjoining the pan is visible, repaired in the past with modern solder.

We can now place this wine strainer in context, thanks to finds of similar vessels, often accompanying small Roman bronze saucepans know as trullei (singular, trulleus). Trullei were part of the standard equipment of Roman legionaries, but wine strainers were not everyday items issued to Roman troops, and strainers like ours could have been made in Britain. There are examples of strainers been buried with trullei or bronze bowls, for instance the Kingdtone Deverell hoard, discovered in 2005 and now in Salisbury Museum, and the Langstone hoard from Newport, Wales, found in 2007. The Langstone hoard may have been a ritual deposit made by Britons, but elsewhere, strainers and bronze vessels have been found in graves, as part of the feasting and drinking equipment which accompanied the social elite of late Iron Age and early Roman Britain to the next world.

Certainly at the top of Iron Age society in the Essex region, there were people enjoying wine imported from the Roman world as much as a century before the Claudian invasion of AD 43. We know this from high-status graves where wine amphorae were buried, and you can see examples of such amphorae in Saffron Walden Museum. So our wine strainer could date to around the 1st century AD, either just before or after the Roman conquest. It is a pity that we do not know where it was found, but we can imagine a local British aristocrat using this as part of a wine-drinking ceremony or special feast.

Cheers!

 

The wine strainer is on display at the Museum until 1st November 2018, where you can learn more about this object and life in Roman times.

Object of the Month -September 2018

September’s Object of the Month is a collection of fossilised teeth chosen by James Lumbard, Natural Sciences Officer.

These fossilised teeth come from the extinct fish Ptychodus (pronounced tie-co-duss) which lived across the Americas, Europe and Asia. They are closely related to modern sharks and rays, but may not have been direct ancestors. Some species grew up to 10 metres long, feeding on the large shellfish that existed during the Cretaceous period, 66–145 million years ago. Although they had similar diet and teeth to modern rays, they looked more like modern nurse sharks, which cruise the seabed for small fish and shellfish.

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Object of the Month – August 2018

Red squirrel - August object of the month

August’s Object of the Month is a red squirrel. The mammal was chosen as Object of the Month by Sarah Kenyon, Natural Sciences Officer.

This red squirrel was found dead at Saffron Walden, Essex in August 2003. It had been run over by a car in Landscape View. A member of the Uttlesford group of Essex Wildlife Trust gave it to Saffron Walden Museum to be preserved. The body was mounted, or stuffed, by a taxidermist. This red squirrel has russet red fur on its body and tail, with white fur on its chest and belly. Male and female squirrels look identical.

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