Tag Archives: museum

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

 

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.

Continue reading

A bit behind the scenes

An update from James Lumbard, Natural Sciences Officer.

The Geology Gallery received a lot of attention in the run-up to the festive period thanks in no small part to the help provided by Cali, the latest addition to the natural sciences volunteer team. After a short training session in how to carefully clean specimens using a conservation vac and a paintbrush, we were away, and have already cleaned around half of the objects on display at the time of writing. It should be a fairly quick job to finish the rest of the objects in the ‘table-top’ display cases, leaving only a dozen or so in wall-mounted cases. This is part of regular ‘deep cleans’ that help care for museum objects, and will help us double-check and update the information we hold about each object. Many museums are also ‘Accredited’ which means that they uphold certain national standards of collection care, and this work contributes to Saffron Walden Museum maintaining its Accredited status year-on-year. Meanwhile, the photos we take can be used for everything from social media to encouraging researchers to visit the collection.

Fossil ammonite found in Saffron Walden. 150-200 million y.o.

At the start of December I visited the Essex Field Club’s (EFC) annual exhibition and social at Wat Tyler Country Park, near Basildon. The EFC is a volunteer-run society of amateurs and professionals who compile and look after a county-wide database of the wildlife and geology of Essex. The club’s secretary, Fiona Hutchings, very kindly introduced me to members from each specialty so I could speak to them about the natural sciences exhibition this summer, called Take Away the Walls. My plan is to hold a museum-based exhibition showcasing the wildlife of north-west Essex, and to run activities bringing together wildlife organisations and community groups across Uttlesford to help people enjoy the outdoors in new ways that will benefit their own health, and the health of the local environment. The exhibition and activities will really start to take shape behind the scenes soon, so keep your eyes peeled for more updates in the coming months.

Fossil bryozoan in flint. Tiny bryozoa live in coral-like colonies (above), but are much more complex internally.

At the end of this month I will be attending a short training seminar entitled ‘Finding Funds for Fossils, Ferns and Flamingos’, hosted by the Natural Sciences Collections Association (NatSCA) at the World Museum, Liverpool. NatSCA are a nationwide ‘subject-specialist network’ of museum professionals working in the natural sciences who have an active programme of meetings, training courses and conferences throughout the year. This particular event is all about how to successfully attract funding and support to care for and promote natural sciences collections in museums, and I look forward to putting my new-found knowledge into use to benefit the tens of thousands of natural sciences specimens at Saffron Walden Museum.

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.

Continue reading

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.

Continue reading

Hello to James

Hello! As I’ve been here since the end of April, it’s well-and-truly time to introduce myself. I’m James Lumbard, and I’m delighted to have been chosen to share the post of Natural Sciences Officer with Sarah Kenyon. I’ve really enjoyed my introduction to the job, the museum and the friendly staff and volunteers who make it such a pleasant place to work and visit. I’m originally from South Wales and moved to East Anglia two years ago. I’ve moved around a few times since then, moving to Tendring district at the start of this year, so it’s great to have the chance to explore Uttlesford and the lovely town of Saffron Walden.

Continue reading

Object of the Month – June 2018

 

June’s Object of the Month is a silk reticule or bag, made in the 1820s to support the campaign to abolish slavery. The reticule was chosen as Object of the Month by Leah Mellors, Collections Officer (Human History). We featured the reticule on our blog last year, when we were raising money to fund vital conservation work. You can read all about the history of the reticule here

Our previous Collections Officer (Human History), Leah Mellors, acquired funding to carry out conservation work on the reticule, which was in very poor condition. The silk had faded and was badly stained, large sections of the silk had shattered and were coming loose and the reticule could not be handled or displayed without causing further damage. With funding from the Daphne Bullard Award, the Saffron Walden Quaker Meeting and individuals in our local community, the museum was able to pay a textiles conservator, Poppy Singer to carry out conservation work on the reticule. 

Poppy discovered that the bag had been folded over at the top and sewn down to cover some old damage, so she undid the stitching, cleaned and reshaped the reticule to its original shape. She made an internal support bag and pad to support the new shape of the reticule, adhered the fragmentary silk, and added very fine netting over the top to prevent future damage. Thanks to Poppy’s work, the reticule can now be carefully handled and displayed in the museum for short periods of time.  

Reticule before conservation

Reticule after conservation

You can see the reticule on display in the museum throughout June.

Half-term at the Museum

Half term week saw the museum busy with children engaged in activities on Tuesday and Thursday for our “Down on the Farm” week, linked to our current exhibition From the Hazely Brick Earth: Agriculture in North-West Essex. The activities organised by our Education and Outreach Officer, Charlotte, and supported by learning volunteers, Jane Laing, Jeanette Fulcher and Jane Evans, proved popular with our regular visitors as well as many who were visiting the museum for the first time.

On Tuesday visitors could make Salt-Dough animals and on Thursday they made Pom Pom animals.

The salt dough was especially popular, (though perhaps not so popular with our lovely cleaner who had to remove some tricky spots from the carpet the following day!). Although the idea was to make farm animals, the children let their imaginations run riot and produced all sorts of exotic creatures using the cutter provided as well as a few free style creations, including a 3D sloth on a palm tree! Sadly, there is no photographic evidence of that particular creation!

There was also a Long-Horn Cow Trail taking the children to nearly every part of the museum to search for the cardboard cows that were ‘grazing’ there and to find the answers to the questions on each cow. The cows can still be seen grazing around the museum and the trail will be available until our next activities in Easter.

On Thursday the activity was to create pom pom animals. Again the aim initially was to create farm animals but an exotic menagerie was soon created, including more dinosaurs, a flamingo, some terrifying spiders and a giraffe. Featured in the photo are Dave and Gary, a pair of rather jolly pom pom diplodocus!

For the first time this half term the activities could be pre-booked and there was a charge of £1.50 per child for the 30 minute activity. This system will operate for all our holiday activities in future to allow us to provide better quality activates and enable visitors to pre-book in the weeks before the event to guarantee a slot.

The next activity days will be during the Easter holidays on Tuesday 3 April and Thursday 12 April. On Tuesday 3 April, the theme will be Brilliant Books, when children will have the opportunity to create a concertina book and write their own story. On Thursday 12 April our Spring Day activity will be to make a yarn sheep. On both days there will be free activities running alongside the pre-booked activity – Animal Stories in the Natural History gallery on 3 April and on an Animal Trail on 12 April.

For more information about our programme of events, see our Upcoming Events page or take a look at our programme