It is the larva of the elephant hawkmoth which earned the species its name. This bizarre looking larva has a snout which it can extend so that it looks something like an elephant’s trunk.

I went to my reference books for the answer and it didn't take long to discover that it was the larval stage of the elephant hawk moth. On the internet, I found beautiful images of it.

Roger, who has been moth trapping most evenings during 30 Days Wild, as he did last year during the Nottinghamshire Wildlife event, says, take the bright pink Elephant Hawk Moth, for instance, or ...

The loudest of all is the elephant hawkmoth, below, which is pretty in pink. More than an inch long, this brute boasts a shocking pink undercarriage and wings patterned with olive and yet more pink.