Greater Death's Head Hawkmoth

Sphingidae; Sphinginae; Acherontia lachesis (Fabricius, 1798). This late instar larva of the Greater Death's Head Hawkmoth is an impressively large caterpillar. It has a tail horn, as do all Hawkmoth larvae, but this one is spiky, which makes it look rather aggressive. Most Hawkmoth larvae appear to be slow moving, submissive creatures, but when I tried to pick up this one, it wagged its head violently from side-to-side. Wikipedia's article says that it also makes a clicking sound, but I did not hear that. My lasting impression of this caterpillar is that it looked beautiful, but slightly scary and altogether very alien, like a creature from a distant galaxy.