This strange looking caterpillar looks as if he's just been to a psychedelic hairdresser! By comparison the moth he will turn in to is a very subdued and subtly mottled grey!
How strange, they are so colourful. Are the hairs poisonous? We have two white cedar trees in our garden and from time to time get white cedar moth caterpillars on the tree and they strip it bare. The hairs of the caterpillars cause serious problems if you get them on your skin.