Hawkmoths are truly spectacular to observe. They are among some of the largest members of the order Lepidoptera. As caterpillars, they have sleek muscular bodies with sidestripes and a tail "horn"; some evoke alarm for their resemblance to poisonous snakes. As adult moths, they use their long tongues to drink nectar from flowers while hovering. Found worldwide, many travel prodigious distances: hummingbird hawkmoths regularly fly to Britain from...