Markham's Storm-Petrel Hydrobates markhami

Small dark seabird of Humboldt Current, although relatively large for a storm-petrel; not seen from shore, but breeds inland in Atacama Desert where it visits colonies at night to avoid predators. Favors warmer waters beyond cooler inshore zone. Plumage all dark except for bold pale bands on upperwing; also note deeply forked tail. Told from similar size Black Storm-Petrel (which favors cooler inshore waters) by bolder pale wing bands, shallower wingbeats, and smaller feet (big feet of Black Storm-Petrel often hang down).