Male wild turkey, Meleagris gallopavo, in springtime display posture.
JOHN CANCALOSI/National Geographic Creative
Female white-tailed deer, Odocoileus virginianus, in a snow shower.
Captive corn snake, Elaphe guttata guttata.
United States of America.
Green frog tadpole, Rana clamitans, intermediate stage with back legs.
Close up of the head of a California sea lion, Zalophus californianus.
Upper early Cretaceous ammonite fossil under ultraviolet light.
California sea lion, Zalophus californianus, scratching it's chin.
Close up portrait of a nursery web spider, Pisaurina species, carrying her egg sac.
Mud puppy salamander, Necturus maculosus, retains gills throughout life.
Fast running waterfalls cascading over rock.
Letchworth State Park, New York.
Young bull moose, Alces alces, eating in water.
Tupper Lake, Adirondack Mountains, New York.
Brown pelican, Pelecanus occidentalis, in flight over water.
Portrait of a captive American bald eagle, Haliaeetus leucocephalus.
Beautiful waterfalls cascading over rock cliffs into a pool below.
Boys playing soccer.
Veil-like waterfalls cascading over rock in Treman State Park.
Robert H. Treman State Park, New York.
Endangered California condor, Gymnogyps californianus, in flight.
Ammonite fossil, Cleoniceras species, under ultraviolet light.
Northern rubber boa, Charina bottae, on a lichen-covered rock.
Close up portrait of an alpaca, Lama pacos.
Close up of a sample of malachite.
Katanga Province, Congo.
Vulnerable Chiricahua leopard frog or Ramsey Canyon leopard frog.
Portrait of a captive northern goshawk, Accipiter gentilis.
Lucifer Falls cascading over layers of ancient rock.
Lucifer Falls, Robert H. Treman State Park, New York.
California sea lions, Zalophus californianus, vocalizing.
Two pileated woodpecker chicks, Dryocopus pileatus, looking out of their nesting cavity in a tree trunk.
Washington, District of Columbia.
A per examining a weathered rock wall of Marcellus shale, a natural gas bearing rock. The gas is extracted using controversial fracking or hydraulic fracturing processes.
Marcellus, New York.
Northern rubber boas, Charina bottae.
Nearly metamorphosed green frog, Rana clamitans, with remnants of tail.
Brown pelican, Pelecanus occidentalis, in flight.
Captive endangered California condor, Gymnogyps californianus.
Gray-breasted jay, Aphelocoma ultramarina, formerly called Mexican jay.
Curve-billed thrasher, Toxostoma curvirostre,in a cholla cactus nest.
Waterfall cascading over a rocky cliff into a pool below.
Aravaipa Canyon Wilderness, Arizona.
Cliffs towering above boulders in a creek bed.
Small munsterlander dog, Kleiner munsterlander, running in a field.
Captive Pacific gopher snake, Pituophis melanoleucus catenifer, close up.
Captive Pacific gopher snake, Pituophis melanoleucus catenifer.
Portrait of an adult green frog, Rana clamitans.
Close up of the head of an adult green frog, Rana clamitans.
Praying mantis, Mantis religiosa, eating a common meadow katydid.
Small and large waterfalls cascading over ancient rock.
Fossilized fish, Paramblypterus species.
Black-capped chickadee, Poecile atricapilla, in a snow-dusted tree.
Female white-tailed deer, Odocoileus virginianus, in snowy landscape.
Captive eyelash viper, Bothriechis schlegeli, coiled on a tree branch.
Emerald, green variety of beryl, berylium aluminum silicate.
Ithaca, New York.
A Harris' hawk feeds its chick in a saguaro cactus.
Arizona, United States.
Close up of a spectacled caiman, Caiman crocodilus.
Portrait of a ring-necked pheasant, Phasianus colchicus.
Sonoran Desert, Arizona.
A pair of thorn bugs, Umbonia species, on a tree branch.
A group of yellow-spotted hyraxes perch on a rock.
Close up of ocean or orbicular jasper, cryptocrystalline quartz.
Fossilized crinoid, Jimbacrinus bostocki, from early Permian.
Gascoyne Junction, Western Australia, Australia.
Fossilized ammonite, Desmoceras species, from upper early Cretaceous.
Portrait of a Gambel's quail, Callipepla gambelii, vocalizing.
Side-striped palm pit viper, Bothriechis lateralis, on a tree branch.
Close up of a blood-sucking conenose kissing bug, Triatoma dimidiata, the vector of Chagas disease.
Portrait of a blue tick hound, a hunting dog, running.
Portrait of a bullfrog froglet, Rana catesbiena, with its tadpole tail still present.
Polished slice of stalactite of rhodochrosite, manganese carbonate.
Close up of two gila woodpeckers in a cactus.
Sonoran Desert, Arizona, United States.
Close up of a gray wolf lying in snow.
Pennsylvanian age fossil of a fern, Pecopteris.
Close up of a gyrfalcon.
Wyoming, United States.
Close up of a specimen of bauxite, aluminum ore.
La Baux, France.
Close up of a sample of chalcopyrite, the major ore of copper.
Ithaca, New York, United States.
A den of gravid timber rattlesnakes, Crotalus horridus horridus, basking to bring their young to term.
Pyrite, FeS2, iron sulfide, or fool's gold.
A European white stork trapped in a plastic bag in a garbage dump.
Portrait of a boy running in an autumn landscape.
Olivine in basalt. This material originated in the Earth's mantle.
San Carlos Indian Reservation, Arizona.
Close up of a fossilized ammonite.
Female black widow spider, Latrodectus hesperus, among silk strands.
Close up of an amphibian fossil from the late jurassic age.
Close view of a bearded vulture.
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