To feed, the hawk moth unrolls a long proboscis, sticks it in a flower like a straw, and slurps up nectar. It looks like a hummingbird feeding. Like the hummingbird, the moth has to be stable in the air to get a drink. Biologist Ty Hedrick filmed the moths with high-speed video to try to understand how they hold steady.
Source: http://www.npr.org/2011/11/04/142024620/how-an-elegant-moth-stays-aloft?ft=1&f=1007
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