A Coleophora case on Greater Stitchworth.
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Lovely photos again. For those who haven't seen them before, Coleophora is a genus of micro-moths, with larvae (caterpillars) that construct cases in which they conceal their bodies, a bit like the cases that caddisfly larve make under water.
They stretch their head-parts out from the front of the case and in between the upper and lower layers of their foodplant leaves. In the first of David's photos here you can see two pale 'blotches' in the leaf, with a tiny hole in each blotch, where the larva has stretched out as far as it can from its case, eating away the green matter from inside the leaf, and it is now starting to create a third blotch.
(No reason to doubt David's identification, but it's not a species I know so can't confirm it 100% and thus haven't clicked on 'I agree'.)
Entomologist and biological recorder
This is the only record from the reserve so confirmation of the ID here would be helpful. Probably should have reared it on really.
Lat/Lng: 51.5, -0.4
OS grid ref: TQ1583