The Pine Weevil right is a harmful pest in UK forests because the eggs are laid in the stumps of felled conifers from which the larvae then feed and the adult beetles will feed on the bark of the replacement young conifer plants.
A Weevil beetle attacking a hawk moth caterpillar
When I was a teenager I reared hawk moths and sold them to butterfly farms and other collectors, but I would always release many surplus stock back into the wild. On one occasion I was releasing some almost full grown hawk moth caterpillars onto trees when I noticed a large weevil beetle hanging upside down from its two back legs. It had its two front legs out straight in a crucifix position and it was motionless and looked very strange. It was hanging from the bottom horizontal branch of a tall poplar tree low to the ground. I guessed it was waiting for something. So I thought it would be a good idea to place one of my large hawk moth caterpillars in front of the beetle as the caterpillar was so much larger I thought I could rescue it if anything happened.