When Matthew Oates invited me along to Savernake Forest in Wiltshire on Sunday to check on some of the Purple Emperor larvae hes been monitoring there this year, i jumped at the chance. I'd never seen these incredible creatures in the wild before - they are so blimmin' hard to find! Over the last couple of years, ive been monitoring adult iris at Oversley Wood and they are truly fascinating butterflies. I spent some time searching the sallows for hibernating larvae earlier this year without success so to finally be able to see these little guys was quite possibly a once in a lifetime opportunity.
I also invited Phil Corley along though i dont think he was too impressed with the early morning :) We spent most of the day admiring these gorgeous caterpillars, taking photos, grilling Matthew and (in Matthew's case) climbing up a ladder into the sallows :) You wouldn't think a caterpillar could have so much character but believe me, these guys do. Never seen anything like them! My knowledge was put to the test when Matthew took us to the monument area (an iris hotspot) and asked me to locate the male congregation area and their favourite perches. I passed both tests with flying colours so ive obviously learnt something over the last 2 years :) We saw 5 larvae altogether yesterday but 2 others have disappeared so they might've been "crunched" :(
Purple Emperor eggs are laid on the upperside of sallow leaves and hatch after about 9-10 days, depending on the weather. After the first moult, the caterpillar looks like the one above with those very unique "horns". The larvae at this time of year are no more than 1.5cm long (likely smaller) and are often found resting on a self-spun silk pad at the tip of a sallow leaf. I believe the top half of the body is raised from the surface of the leaf to help minimise the amount of visible shadow. How they know how to do this is beyond me! When the leaves begin to fall, the larvae go in search of a hibernating spot on the branches where they will spend the remainder of the winter before becoming active again in April. None of the larvae we saw on Sunday had started to properly colour up yet ready for hibernation. If they hibernate on a branch, they usually turn a brownish/greyish colour. Those that hibernate next to buds are often red/brown/yellow and usually dont survive as they are so easy to spot. I love the Tit family, dont get me wrong, but they love to chomp on these poor caterpillars and especially like eating Brown Hairstreak eggs/larvae too. CURSE THEM!
All in all, a fantastic day out. Thanks again to Phil for letting me use his incredible Canon MP-E. I have a few more shots im hoping to post, depending on how they look after post-processing so stay tuned :) A full report from the day and more photos will be up on my blog (link below) very soon and also on The Purple Empire. Also, lots more updates on the Warwickshire Brown Hairstreak egg searching to come.
Information: Purple Emperor (one | two)
Technical: 1/200 | f/13 | 65mm | ISO200
Camera/Lens: Canon EOS 500D | Canon MP-E 65mm f/2.8 1-5x Macro
Visit My Blog | Follow Me On Twitter | BC Warwickshire Twitter | BC Warwickshire
-----------------------------------------------------------------------------------------------------------------------------------------------
© Gillian Thompson 2011 (eorlingas@gmail.com).
This image is not to be used, copied or edited without my written permission.
-----------------------------------------------------------------------------------------------------------------------------------------------