Big Catapillar

Someone suggested that this might be a 'Spitfire' ... but I don't think it is. Actually, it's the biggest Caterpillar I've ever seen.. hence the pen to get a check on it's size. That day there were about 5 of them that I noticed in the immediate area.. but only this one made it up this tree to safety.. the others all got caught by ants, which is rather sad, but that's natural selection for you. I expect that it was the very very hot dry day that we had that triggered them all, coming from the ground to go into the trees, he moved very quickly too, about 2m a minute over rough ground.~AB