What apart from the skull-like pattern on its back is unusual about a death's-head hawkmoth?

Question

Transits of Venus occur in a pattern, with pairs of transits 8 years apart separated by much longer gaps, that repeats every how many years?

Answer 1

It can squeak, or chirp
The hawkmoth's ability to make a sound is not unique among moths, however among nearly all the rest the sounds are audible only by other moths, other insects or potential predators, rather than audible to the human ear as the hawkmoth's is. The hawkmoths also have an ability to mimic the scent of honeybees; they raid bees' nests for honey.