Blue-footed boobies are well known for their name, but their unusually-colored feet serve several purposes in the wild.

The bill is thin and pale gray. Breeding male: blue-gray above, including most of head and back. Crown has a black line at the forecrown that extends along the sides of crown; white eye ring ...

Blue-footed boobies are aptly named, and males take great pride in their fabulous feet. During mating rituals, male birds show off their feet to prospective mates with a high-stepping strut.

And in the case of the male blue-lined octopus, his neurotoxin supply serves as a defensive mechanism against his mate. Sexual cannibalism is documented across a wide range of species ...