Me and my friend found one of these in Berkhamsted High Stree in the last week of August. It had fallen off a tree and it was scary.
The larvae are stout, reaching 120–130 mm, with a prominent tail horn.
All three species have three larval color forms: typically, green, brown, and yellow.
Larvae do not move much, and will click their mandibles or even bite if threatened.
When mature, they burrow underground and excavate a small chamber where they pupate.
Based on information supplied by Mandy.
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