U.S. Geological Survey scientists estimate that the adult population of humpback chub (Gila cypha) in the Grand Canyon increased 50 percent between 2001 and 2008.
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U.S. Geological Survey scientists estimate that the adult population of humpback chub (Gila cypha) in the Grand Canyon increased 50 percent between 2001 and 2008.
Japanese flowering cherry trees in bloom and Jefferson Memorial.
Japanese flowering cherry trees in bloom and Jefferson Memorial.
Japanese flowering cherry trees in bloom and Jefferson Memorial.
Japanese flowering cherry trees in bloom and Jefferson Memorial.
Japanese flowering cherry trees in bloom and Washington Monument.
Japanese flowering cherry trees in bloom and Washington Monument.
Japanese flowering cherry trees in bloom and Washington Monument.
Japanese flowering cherry trees in bloom and Washington Monument.
Japanese flowering cherry trees in bloom and Washington Monument.
Japanese flowering cherry trees in bloom and Washington Monument.
Japanese flowering cherry trees in bloom and Washington Monument.
Japanese flowering cherry trees in bloom and Washington Monument.
Japanese flowering cherry trees in bloom and Washington Monument.
Japanese flowering cherry trees in bloom and Washington Monument.
Japanese flowering cherry trees and Tidal Basin.
Japanese flowering cherry trees and Tidal Basin.
Red firs in the Sierra Nevada
Red firs in the Sierra Nevada
Brewer's sparrow (Spizella breweri) held by field technician.
Brewer's sparrow (Spizella breweri) held by field technician.
Post-doctoral student, Kevin Ellison, bands an eastern meadowlark on a Conservation Reserve Program field as part of a tree-row removal project in southwestern Wisconsin.
Post-doctoral student, Kevin Ellison, bands an eastern meadowlark on a Conservation Reserve Program field as part of a tree-row removal project in southwestern Wisconsin.
John Warzybok secures a Brewer's sparrow (Spizella breweri), White Sands Missle Range, New Mexico.
John Warzybok secures a Brewer's sparrow (Spizella breweri), White Sands Missle Range, New Mexico.
John Warzybok records data whille Caroline Poli secures a Brewer's sparrow (Spizella breweri) for assessment, White Sands Missile Range, New Mexico.
John Warzybok records data whille Caroline Poli secures a Brewer's sparrow (Spizella breweri) for assessment, White Sands Missile Range, New Mexico.
John Warzybok records data whille Caroline Poli secures a Brewer's sparrow (Spizella breweri) for assessment, White Sands Missile Range, New Mexico.
John Warzybok records data whille Caroline Poli secures a Brewer's sparrow (Spizella breweri) for assessment, White Sands Missile Range, New Mexico.
Brewer's sparrow (Spizella breweri) being measured, White Sands Missile Range, New Mexico.
Brewer's sparrow (Spizella breweri) being measured, White Sands Missile Range, New Mexico.
Caroline Poli and John Warzybok assess Brewer's sparrows (Spizella breweri) at White Sands Missile Range, New Mexico.
Caroline Poli and John Warzybok assess Brewer's sparrows (Spizella breweri) at White Sands Missile Range, New Mexico.
Brewer's sparrow (Spizella breweri) being weighed on digital scale, White Sands Missile Range, New Mexico.
Brewer's sparrow (Spizella breweri) being weighed on digital scale, White Sands Missile Range, New Mexico.
Queen angelfish swimming in an aquarium.
Queen angelfish swimming in an aquarium.
Queen angelfish swimming in an aquarium.
Queen angelfish swimming in an aquarium.
Sampling bags holding Brewer's sparrows (Spizella breweri), White Sands Missile Range, New Mexico.
Sampling bags holding Brewer's sparrows (Spizella breweri), White Sands Missile Range, New Mexico.