An ice-covered bison in an autumn snow storm in Yellowstoen National Park.
An elk cow on a snowy morning near Lake Minnewanka in Banff National Park in Alberta,Canada.
Sun beams pour through the trees on Highway 101 south of Crescent City, California in the redwoods.
A black-legged kittiwake in flight
A wet baby African elephant sucks her trunk as she follows her mother after a bath in the Ewaso Ng'iro River in Samburu in Kenya.
A red dahlia in a dahlia farm in Canby, Oregon.
An approaching storm on Rialto Beach in Olympic National Park in Washington state.
Spectacled Caiman 091203_490
A spectacled caiman on the Cano Negro River in Costa Rica.
A basilisk lizard perches on a branch in the Rio Frio River in northern Costa Rica. If he spots an insect like a butterfly he will run across the top of the water to catch it, giving him the nickname "The JesusChrist Lizard".
Black-crowned Night-Heron_Immature 091203_281
An immature black-crowned night-heron perched on a tree buttress above the Rio Frio River in Cano Negro in Costa Rica in December.
Great Horned Owl
A great Horned owl in a cottonwood tree at Malheur National Wildlife Refuge in southeastern Oregon in autumn.
Osprey Nest 080413_138
An osprey hovers briefly above its nest with grasses in it talons as his matewaits to help with the remodelling. Photographed at Snag Boat Bend National Wildlife Refuge in Oregon.
Green Violet-ear Hummingbird
A green violet-ear hummingbird sticking his tongue out while perched on a branch at Savegre in the Tallamanca Mountains of southern Costa Rica.
Red and White Dahlia
A red and white dahlia.
Howler Monkey 091202_852
A young howler monkey eating a vine in the rain forest of Costa Rica.
Sleeping Polar Bear
A polar bear naps on an ice floe in the arctic in Svalbard, north of Norway.
Polar Bear and Glaucous Gull 080712_176
This polar bear was in a never-ending battle with the glaucous gulls at a seal carcass on an ice floe in the arctic region of Svalbard north of Norway in July.
Mesa Arch Flare
Mesa Arch in Canyonlands National Park at sunrise.
Dog Walk 120130_012
A January morning dog walk on a flooded trail in Oregon.
Newborn African Elephant 100919_146
A wild newborn elephant walks in the shelter of his mother and aunts at Samburu in Kenya.
Rocky Mountain Elk HER019f
A bull elk feeds on a hill side just under the low cloud cover over a canyon in Wyoming in autumn.
Facial detail of a young Atlantic walrus in Spitsbergen. The whiskers are extremely sensitive and are used to detect food as he forages through the mud of the sea floor.
Female Cheetah with Cub 070918_013
A female cheetah snuggles with her cub as the sun is setting on the Masai Mara Preserve in Kenya.
Apres l'Amour 100905_548
Mating lion pair in the Masa Mara in Kenya.
African Elephant 100911_929
An African elephant portrait from the Masai Mara in Kenya.
Face Rock is a sea stack in Bandon, Oregon. The rock is said to be the visage of a Native American princess looking toward the sky, refusing the acknowledge the sea monster, Komax, who has her in his grip below.
Violet-headed Hummingbird 091207_105
A violet-headed hummingbird perched on a limb in in the mountains of southern Costa Rica.
American Bison 080927_029
An American bison standing in a field of tall grass.
A female leopard in Samburu in Kenya.
Full-maned Lion 100905_511
A full-maned lion with a wind blown mane in the Masai Mara in Kenya.
Sunset on Acacia and Vulture 070918_002
Sunset on the Masai Mara in Kenya, with an acacia tree with a vulture silhouetted in the foreground.
Del Norte Redwoods
Evening sunlight filters through redwoods in the Del Norte Redwoods are of northern California.
Zebra Stripes 100909_701
The stripes of three zebras drinking at a waterhole in the Masai Mara.
Resplendent Quetzal 091208_180
A male Resplendent Quetzal displays on a wild avocado tree limb during breeding season in the mountains of southern Costa Rica.
Rocky Mountain Elk Feeding in Snow HER046k
A bull elk feeding in deep snow in Wyoming in February.
A mountain bog gentian growing near Breitenbush Lake in the Cascade Mountains of Oregon.