I'm not an expert and you find several sawflies on birch trees especially
Croesus septentrionalis. Your picture looks most like the American species
Croesus latitarsus - I don't know whether that's found in UK?
Yes, strange that defensive mechanism - quite a few larvae do that - I saw it earlier in the year with pine sawflies.
Quote:
Originally Posted by borderglider  I found these caterpillars on a birch tree in my garden. I posted them on FLICKR and somebody suggested that they were probably sawfly larvae. They were quite small - about 2 cm long and they had this dramatic defence behaviour of arching their tails when anything cast a shadow on them. Any help with ID would be great.
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