Slaty-backed Gull (2005-016)
Contributing photographers indicated by (ph.)

Initial observer(s):
Alvaro Jaramillo (ph.)
David Vander Pluym

Corroborating observers and additional sources:
Todd Easterla (ph.)
Rick LeBaudour (ph.)
Martin Meyers (ph.)
Joseph Morlan (ph.)
Jeff Poklen (ph.)
Don Roberson (ph.)
Michael M. Rogers
Daniel S. Singer (ph.)
Francis Toldi

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