The Galapagos Islands, 2006 & 2008

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Portrait of an adult Swallow-tailed gull. Darwin's Bay, Genovesa (Tower). These gulls feed nocturnally on squid, which rise to the surface at night in search of plankton, and their large eyes are probably an adaptation for that.
Copyright © 2006 John Van de Graaff

Portrait of an adult Swallow-tailed gull. Darwin's Bay, Genovesa (Tower). These gulls feed nocturnally on squid, which rise to the surface at night in search of plankton, and their large eyes are probably an adaptation for that.

Bird Photographs by John Van de Graaff