Michael Quinton / Red Squirrel (Tamiasciurus hudsonicus) collecting poisonous Fly Agaric (Amanita muscaria) mushroom, which it can digest with no ill effect, Alaska

Suzi Eszterhas / Aye-aye (Daubentonia madagascariensis) digging for insects in tree with long finger, Duke Lemur Center, North Carolina

Piotr Naskrecki / Snow Scorpionfly (Boreus brumalis) pair mating on ice, Massachusetts

Piotr Naskrecki / Snow Scorpionfly (Boreus brumalis) female on ice, Massachusetts

Piotr Naskrecki / Snow Springtail (Hypogastrura harveyi) on snow, Massachusetts

Mark Moffett / Five-spotted Hawkmoth (Manduca quinquemaculata) feeding on flower nectar, Sonoita, Arizona

Sumio Harada / Red Squirrel (Tamiasciurus hudsonicus) feeding with cone remains close by, Montana

Sumio Harada / Mountain Goat (Oreamnos americanus) kids playing, Glacier National Park, Montana

Sumio Harada / Bighorn Sheep (Ovis canadensis) ram and ewe on cliff, Glacier National Park, Montana

Sebastian Kennerknecht / Virginia Opossum (Didelphis virginiana) in backyard at night, Santa Cruz, Monterey Bay, California

Sebastian Kennerknecht / Great Egret (Ardea alba) standing on kelp bed hunting, Santa Cruz, Monterey Bay, California

Michael Durham / Red-tailed Hawk (Buteo jamaicensis) roosting on a fire escape in downtown Portland, Oregon

Michael Durham / Red-tailed Hawk (Buteo jamaicensis) roosting on a fire escape in downtown Portland, Oregon

Michael Durham / Red-tailed Hawk (Buteo jamaicensis) fledgling pair in nest on fire escape in downtown Portland, Oregon

Heidi & Hans-Juergen Koch / American Alligator (Alligator mississippiensis) detail of skin on back which provides protection and aids in thermoregulation, dark skin absorbs heat and the bony plates called scutes work like sun co...

Heidi & Hans-Juergen Koch / American Alligator (Alligator mississippiensis) detail of skin on back which provides protection and aids in thermoregulation, dark skin absorbs heat and the bony plates called scutes work like sun co...

Norbert Wu / Longnose Butterflyfish (Forcipiger flavissimus) long nose helps it feed in crevices, Hawaii

Michio Hoshino / Grizzly Bear (Ursus arctos horribilis) drinking at water's edge, Alaska

Jaymi Heimbuch / California Sea Lion (Zalophus californianus) on harbor buoy, Monterey Bay, California

Donald M. Jones / Mountain Pygmy-Owl (Glaucidium gnoma) with false eye spots on back of head, western Montana

Piotr Naskrecki / Wolf Spider (Lycosidae) on snow, Massachusetts

Mark Moffett / Five-spotted Hawkmoth (Manduca quinquemaculata) feeding on flower nectar, Sonoita, Arizona

Mark Moffett / Five-spotted Hawkmoth (Manduca quinquemaculata) feeding on flower nectar, Sonoita, Arizona

Michael Durham / Red-tailed Hawk (Buteo jamaicensis) roosting on a fire escape in downtown Portland, Oregon