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ID: K3570
Grand Prismatic Spring, Yellowstone National Park, Wyoming
ID: K3561
Tower Fall, Yellowstone National Park, Wyoming
ID: K3558
Lower Yellowstone Falls flowing into Yellowstone River, Yellowstone National Park, Wyoming
ID: K3554
Falls, Yellowstone National Park, Wyoming
ID: K3373
Men ice fishing on frozen lake, Bridgton, Maine
ID: K2117
Bobolink perched on plant
ID: K1794
California thrasher
ID: K17243
Hell Creek Formation, Montana
ID: K17223
Sickle claw of Deinonychus antirrhopus (terrible claw), collected by Barnum Brown and Peter Kaisen, Buster Creek, Cashen Ranch, Crow Indian Reservation
ID: K1681
Beech tree trunk, detail, Tenafly, New Jersey
ID: K15048
Head of wolf spider
ID: K14987
Utetheisa bella moth
ID: K14976
Hemihyalea labecula, moth
ID: K14975
Bumble bee hawk moth
ID: K14974
Graceful clearwing moth
ID: K14973
Halisidota caryde, moth
ID: K14972
Tiger moth
ID: K14971
Imperial moth (Eacles imperialis)
ID: K14970
Imperial moth (Eacles imperialis), side view on leaf
ID: K14967
Royal walnut moth, (Citheronia regalis), extreme close-up, head-on view
ID: K14966
Royal walnut moth (Citheronia regalis)
ID: K14965
Parasites on caterpillar of tomato horn worm sphinx moth
ID: K14964
Tomato hornworm sphinx moth, pupa stage
ID: K14963
Tomato horn worm moth
ID: K14962
White-lined sphinx moth, (Celerio lineata)
ID: K14960
Tulip tree silk moth, (Callosomia angulifera)
ID: K14957
Automeris io moth
ID: K14953
Apantesis argea, moth
ID: K14952
Antheraea polyphemus moth on outstretched hand
ID: K14951
Nessus sphinx moth or hawk moth (Amphion nessus)
ID: K14950
Luna moth (Actis luna)
ID: K14945
Speyeria nokomis (Nokomis fritillary) butterfly
ID: K14944
Regal fritillary butterfly (Speyeria idalia)
ID: K14943
Violet tip or question mark butterfly (Polygonia interrogationis)
ID: K14942
Philotes sonorensis butterfly
ID: K14935
Zebra swallowtail buttefly (Protographium marcellus)
ID: K14921
Zebra swallowtail butterfly, Protographium marcellus, photomicrograph of wing scales
ID: K14890
Western pygmy blue butterfly (Brephidium exilis)
ID: K14889
Weidemeyer's admiral butterfly, underside (Limenitis weidemeyerii)
ID: K14888
Red-spotted purple butterfly (Limenitis arthemis)
ID: K14887
Ruddy daggerwing butterfly (Marpesia petreus)
ID: K14886
Regal fritillary butterfly (Speyeria idali)
ID: K14885
Diana fritillary butterfly, female (Speyeria diana)
ID: K14884
Diana fritillary butterfly, male (Speyeria diana)
ID: K14883
Pacific orangetip butterfly (Anthocharis sara)
ID: K14882
White angled-sulphur butterfly (Anteos clorinae)
ID: K14881
Western painted turtle
ID: K14880
Box turtle, detail of head
ID: K14879
Box Turtle
ID: K14877
Desert iguana
ID: K14876
Horned lizard
ID: K14875
Banded gecko
ID: K14874
Greater earless lizard
ID: K14871
Desert night lizard
ID: K14869
Niagara Falls, viewed from Canada
ID: K14868
Niagara Falls
ID: K14867
Flag of the United States, 48 stars, flying against blue sky
ID: K14866
Ohanapecosh River, Mount Rainier National Park, Washington
ID: K14865
Trees, Kautz Creek flood, Nisqually River, Mount Rainier National Park, Washington
ID: K14864
Eroded rocks, Mount Edith Cavell, Jasper National Park, Alberta, Canada
ID: K14863
Stream from Nisqually Glacier, Mount Rainier National Park, Washington
ID: K14862
Sedimentary rock showing erosion, Badlands National Park, South Dakota
ID: K14861
Glacial erosion, alpine zone, Rocky Mountain National Park, Colorado
ID: K14860
Sedimentary rock, Badlands National Park, South Dakota
ID: K14859
Rock formations showing erosion, Badlands National Park, South Dakota
ID: K14858
Glacial till, Nisqually Glacier, Mount Rainier National Park, Washington
ID: K14857
Igneous columns in volcanic ash rock, Yellowstone National Park, Wyoming
ID: K14856
White peacock butterfly (Anartia jatrophae)
ID: K14855
ID: K14854
ID: K14852
Red algae in geyser area, Yellowstone National Park, Wyoming
ID: K14851
Red and blue algae at edge of hot pool, Yellowstone National Park, Wyoming
ID: K14850
Red and green algae growing in hot water terraces, Yellowstone National Park, Wyoming
ID: K14849
Meteorite fragment, 66 kg, recovered in Canyon Diablo, Arizona
ID: K14848
Meteorite fragment, 493 kg, recovered in Canyon Diablo, Arizona
ID: K14847
ID: K14842
Guffey Meteorite from Colorado, Hall of Meteorites
ID: K14837
Cape York meteorite, Ahnighito section, Hall of Meteorites
ID: K14833
Black-tailed rattlesnake
ID: K14832
Timber rattlesnake, North America
ID: K14830
Red diamond-backed rattlesnake
ID: K14828
Prairie rattlesnake, North America
ID: K14798
Landscape, Glacier National Park, Montana
ID: K14797
ID: K14796
ID: K14795
Mount Revelstoke, British Columbia
ID: K14794
Columbia River, Mount Revelstoke National Park, British Columbia
ID: K14793
Trees, snowy mountains, Lake Edith, Jasper National Park, Alberta, Canada
ID: K14792
Mount Edith Cavell, Jasper National Park, Alberta, Canada
ID: K14791
Pine forest, Jasper National Park, Alberta, Canada
ID: K14790
Arctic alpine zone, Parker Ridge, Jasper National Park, Alberta, Canada
ID: K14789
Athabasca River, Jasper National Park, Alberta, Canada
ID: K14788
Alpine zone, Columbia Icefield, Jasper National Park, Alberta, Canada
ID: K14787
Waterfall, Jasper National Park, Alberta, Canada
ID: K14786
ID: K14785
People at foot of glacier, Columbia Icefield, Jasper National Park, Alberta, Canada
ID: K14784
Mountains, Jasper National Park, Alberta
ID: K14783
Landscape, Jasper National Park, Alberta
ID: K14782
Waterfalls, Icefield Parkway
ID: K14781
Bow Lake, Banff National Park, Alberta