Mechanical spy fly?

What's this monster crawling out of my compost heap today?

It's a Cockchafer or May bug, a kind of beetle that terrifies people who leave their windows open on a warm May evening as it flies noisily around like the mechanical spy fly in 'His Dark Materials'.

But they are quite harmless.  Good at climbing though with those grippy little feet.  And look at those beady eyes and feathery antennae.

This is what they look like when young.

Photo:gardening helpdesk