Tim Fitzharris / Blanketflower (Gaillardia sp) close up showing dense pistils in center, North America

Tim Fitzharris / Common Sunflower (Helianthus annuus) group showing symmetrical seed heads, North America

Tim Fitzharris / White's Tree Frog (Litoria caerulea) portrait, North America

Sumio Harada / Mountain Goat (Oreamnos americanus) portrait, Rocky Mountains, North America

Gerry Ellis / Eastern Chipmunk (Tamias striatus) portrait on tree stump, North America

Norbert Wu / Rainbow Trout (Oncorhynchus mykiss) pair, side view, western United States

Mark Moffett / Jumping Spider (Maevia sp) male in courtship posture, North America

Gerry Ellis / Giant Desert Hairy Scorpion (Hadrurus arizonensis) tail, southwest North America

Shattil & Rozinski / Close up of vein in leaf of Aspen tree {Populus tremula} as it changes colour in autumn, USA

Shattil & Rozinski / Close up of veins in leaf of Aspen tree {Populus tremula} in autumn, USA

John Cancalosi / Close-up of Native Copper Nuggets from Michigan, USA

Tim Fitzharris / Nevada Bitteroot (Lewisia trevosia) close up, North America

Tim Fitzharris / Common Sunflower (Helianthus annuus) group showing symmetrical seed heads, North America

Jim Brandenburg / Hoverfly (Syrphidae) mimic of a bee on a Prairie Rose (Rosa suffulta), North America

Tim Fitzharris / Northern Elephant Seal (Mirounga angustirostris) pup, North America

Tim Fitzharris / Crab Spider (Thomisidae) on flower, North America

Tim Fitzharris / House Spider, North America

Tim Fitzharris / House Spider (Tegenaria atrica) on cornflower, North America

Tim Fitzharris / American Painted Lady (Cynthia virginiensis) butterfly feeding on Purple Aster (Aster foliaceus), North America

Ingo Arndt / Yellow-bellied Slider (Trachemys scripta scripta) in duckweed, North America

Ingo Arndt / Yellow-bellied Slider (Trachemys scripta scripta) in duckweed, North America

Ingo Arndt / Yellow-bellied Slider (Trachemys scripta scripta) in pond, North America

Ingo Arndt / Yellow-bellied Slider (Trachemys scripta scripta) with reflection in pond, North America

Michael Durham / Leaf-cutting Bee (Megachile sp) departing a Goldenrod flower (Solidago sp) after collecting nectar and pollen, North America

Michael Durham / Leaf-cutting Bee (Megachile sp) flying towards a Goldenrod (Solidago sp) flower before collecting nectar and pollen, North America

Michael Durham / Leaf-cutting Bee (Megachile sp) flies toward a Goldenrod flower (Solidago sp) abdomen is covered with pollen, North America

Michael Durham / Leaf-cutting Bee (Megachile sp) departing a Goldenrod flower (Solidago sp) after collecting nectar and pollen, North America

Michael Durham / Leaf-cutting Bee (Megachile sp) departing a Goldenrod (Solidago sp) flower after collecting nectar and pollen, North America

Michael Durham / Leaf-cutting Bee (Megachile sp) departing a Goldenrod flower (Solidago sp) after collecting nectar and pollen, North America

Michael Durham / Fly photographed with a high-speed camera in 1/50,000 of a second, North America

Michael Durham / Painted Lady (Vanessa cardui) butterfly on garden flowers, North America

Michael Durham / Water droplet falling from fern leaf, North America

Patricio Robles Gil / Dall's Sheep (Ovis dalli) ram grazing on dried grasses and lichen in the winter, North America

Tim Fitzharris / Orange Daylily (Hemerocallis fulva) with Virginia Spiderwort (Tradescantia virginiana), North America

Tim Fitzharris / White-tailed Deer (Odocoileus virginianus) portrait in tall spring grass, North America

Michael Quinton / Great Gray Owl (Strix nebulosa) portrait, North America

Winfried Wisniewski / Ring-billed Gull (Larus delawarensis) close up portrait, North America

Jan Vermeer / Icelandic Poppy (Papaver nudicaule) colorful flowers in bloom, North America

Mark Raycroft / White-tailed Deer (Odocoileus virginianus) spotted fawn standing in tall grass

Flip de Nooyer / Ring-billed Gull (Larus delawarensis) foraging trash on beach, North America

Flip de Nooyer / Ring-billed Gull (Larus delawarensis) foraging trash on beach, North America

Gerry Ellis / Tiger Swallowtail (Papilio glaucus) butterfly perching on pink flowers, North America

Sumio Harada / Hoary Marmot (Marmota caligata) with vegetation for nest building, Rocky Mountains, North America

Sumio Harada / Hoary Marmot (Marmota caligata) smelling flower in field, Rocky Mountains, North America

Sumio Harada / Mountain Goat (Oreamnos americanus) portrait of kid, Rocky Mountains, North America

Sumio Harada / Yellow-bellied Marmot (Marmota flaviventris) laying on lichen covered rock, Rocky Mountains, North America

Sumio Harada / Yellow-bellied Marmot (Marmota flaviventris) portrait, Rocky Mountains, North America

Tim Fitzharris / Red-breasted Merganser (Mergus serrator) female portrait, North America

Tim Fitzharris / Sea Otter (Enhydra lutris) floating in kelp, North America

Sumio Harada / Western Skunk Cabbage (Lysichiton americanum), Rocky Mountains, North America

Sumio Harada / Small Yellow Lady's Slipper (Cypripedium franchetii) orchid, North America

Sumio Harada / Purple Fleabane (Erigeron purpuratus), North America

Sumio Harada / Mountain Goat (Oreamnos americanus) portrait, Rocky Mountains, North America

Konrad Wothe / House Fly (Musca domestica) close-up, North America

Gerry Ellis / North American River Otter (Lontra canadensis) pair, North America

Tim Fitzharris / Narrowleaf Penstemon (Penstemon linarioides) flower blooming, North America

Tim Fitzharris / Yellow Pond Lily (Nuphar luteum) floating on water surface, North America

Gerry Ellis / Eastern Diamondback Rattlesnake (Crotalus adamanteus) top-view of head and patterned skin, southeastern United States

Michael & Patricia Fogden / Western Hog-nosed Snake (Heterodon nasicus) defense display, North America

Tim Fitzharris / Fisher (Martes pennanti) portrait, North America

Tim Fitzharris / Mule Deer (Odocoileus hemionus) fawn portrait, North America

Tim Fitzharris / Yellow-bellied Marmot (Marmota flaviventris) resting on rock looking at camera, North America

Tim Fitzharris / Northern Elephant Seal (Mirounga angustirostris) portrait on beach, North America

Gerry Ellis / Silver-spotted Skipper (Hesperia comma) feeding, with proboscis, on flower nectar, western North America

Jim Brandenburg / Prairie Smoke (Geum triflorum) flowers at dawn, North America

Sumio Harada / Mountain Goat (Oreamnos americanus) portrait while resting, Rocky Mountains, North America

Sumio Harada / Seedling growing from forest floor, Rocky Mountains, North America

Sumio Harada / Mountain Goat (Oreamnos americanus) portrait, Rocky Mountains, North America

Gerry Ellis / Harbor Seal (Phoca vitulina) head poking out of water surrounded by Kelp, sunbathing, Pacific coast, North America

Gerry Ellis / Eastern Mole (Scalopus aquaticus) emerging from underground burrow, North America

Norbert Wu / Eastern Pocket Gopher (Geomys sp) showing teeth which are used to excavate burrows, North America

Jim Brandenburg / Snowy Owl (Nyctea scandiaca) portrait, North America

Flip Nicklin / Moray Eel (Gymnothorax sp) with Goby (Gobiidae), North America

Mark Moffett / Jumping Spider (Maevia sp) male portrait, North America

Tim Fitzharris / Indian Blanket flowers (Gaillardia pulchella), North America

Jeff Rotman / Close up of Garibaldi fish face {Hypsypops rubicunda}, Channel Islands, California, USA

Michael Durham / Leaf-cutting Bee (Megachile sp) departing a Goldenrod (Solidago sp) flower after collecting nectar and pollen, North America

Michael Durham / Leaf-cutting Bee (Megachile sp) departing a Goldenrod flower (Solidago sp) after collecting nectar and pollen, North America

Sumio Harada / Frost on leaves, Rocky Mountains, North America

Gerry Ellis / Ice and icicles covering tree branches from freezing rain storm, North America

Michael Quinton / Pacific Loon (Gavia pacifica) adult portrait among water lilies, North America

Jim Brandenburg / Dew-covered prairie grasses, North America