Cassin's Auklet (Ptychoramphus aleuticus)
This is a small (175 g), nocturnal, burrow-nesting member of the family Alcidae. It lays a single white egg, which the parents take turns incubating for about 38 days. After it hatches, both parents usually return once each night to feed zooplankton to the chick (mainly copepods and euphausiids, plus some larval fish), which they carry in a special throat pouch that develops for this purpose prior to the breeding season.
		At about 45 days of age, the chick leaves the burrow to begin an independent life at sea (i.e., it "fledges"). Triangle Island supports about 500,000 breeding pairs of Cassin's Auklets, estimated at half of the world's population of this species.