Checkup. USGS biologist Janice Albers performs an ultrasound test on an endangered pallid sturgeon to determine its sex and maturity at the Neosho National Fish Hatchery in southern Missouri. Recent swings in water levels and temperatures could affect efforts by the Fish and Wildlife Service and the Geological Survey to recover the freshwater fish species. (Aaron DeLonay/USGS)

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Keywords: animal, animals, archive, commons, conservation, conserve, creative, education, fauna, fish, flora, habitat, history, image, learning, management, midwest, natural, nature, photo, preservation, preserve, record, reference, refuge, service, states, sturgeon, united, usfws, wildlife, world