Stacked Snow Geese
50,000 Snow Geese ( http://www.birds.cornell.edu/AllAboutBirds/BirdGuide/Snow_Goose_dtl.html ) winter at the Bosque del Apache National Wildlife Refuge in NM. Seeing them at a distance they may look like identical white birds but upon closer inspection there is a great deal of variety such as the slightly darker juvenile (white morph-immature) flying on top in this image. Also roughly 5-10% are not Snow Geese at all but are the very similar looking Ross's Geese ( http://www.birds.cornell.edu/AllAboutBirds/BirdGuide/Rosss_Goose_dtl.html ) .
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