Piotr Naskrecki / Mantid (Taumantis sp) instar, Woburn, Massachusetts

Jim Brandenburg / Thickspike Gayfeather (Liatris pycnostachya) flowering on tallgrass prairie, Crow-Hassan Park Reserve, Minnesota

Tim Fitzharris / Grassland and cumulus clouds, Wind Cave National Park, South Dakota

Pete Oxford / Dead trees in Mammoth Hot Springs travertine terraces, Yellowstone National Park, Wyoming

Suzi Eszterhas / Harbor Seal (Phoca vitulina) pup in shallows, Elkhorn Slough, California

Michael Durham / Silver-haired Bat (Lasionycteris noctivagans) illustrating wing movement during flight, Rogue River National Forest, Oregon, digital composite

Tim Fitzharris / Sunset at Shark's Cove, Oahu, Hawaii

Tim Fitzharris / Grand Teton Range and cloudy sky at Schwabacher Landing, Grand Teton National Park, Wyoming

Tim Fitzharris / Full moon over Mono Lake with wind and rain eroded tufa towers and the eastern Sierra Nevada Mountains in the background, California

Michael Durham / Deer Mouse (Peromyscus maniculatus) jumping as an evasive behavior, Forest Park, Oregon

Tim Fitzharris / Sunset Arch, Grand Staircase-Escalante National Monument, Utah

Yva Momatiuk & John Eastcott / Mustang (Equus caballus) bachelor stallions running together in winter, Wyoming

Bob Barbour / Man overlooking stormy surf on rocks, northern California

Bob Barbour / Jay Moriarity, September 1996, central coast, California

Bob Barbour / Woodies on the warf, Santa Cruz, California

Bob Barbour / Right hand drive 1937 Ford Woodie, owned by Michael and Ilona Hemperly, Haleiwa, Oahu, Hawaii

Bob Barbour / Homer Henard, December 1997, central coast, California

Gerry Ellis / Nurse log stage five temperate rainforest, Olympic National Park, Washington

Thomas Mangelsen / White Ibis (Eudocimus albus) trio feeding at sunset, Ding Darling National Wildlife Refuge, Sanibel Island, Florida

Sumio Harada / Mountain Goat (Oreamnos americanus) leaping in snow, Rocky Mountains, Glacier National Park, Montana

Tom Vezo / Scarlet Tanager (Piranga olivacea) male perched in tree, Long Island, New York

Tim Fitzharris / Yellowstone Falls and Grand Canyon of Yellowstone National Park, Wyoming

Tim Fitzharris / Gaillardia, coreopsis and pointed phlox, blowing in the wind, Texas

Tim Fitzharris / Grand Teton Range and cloudy sky at Schwabacher Landing, reflected in the water, Grand Teton National Park, Wyoming

Yva Momatiuk & John Eastcott / Lone hiker walking along the base of a sandstone butte strong pattern of wavy lines in petrified sand dunes are exposed by erosion, Vermilion Cliffs National Monument, Colorado Plateau, Utah

Yva Momatiuk & John Eastcott / Lone hiker walking along the base of a sandstone butte strong pattern of wavy lines in petrified sand dunes are exposed by erosion, Vermilion Cliffs National Monument, Colorado Plateau, Utah

Yva Momatiuk & John Eastcott / Lone hiker walking on colorful sandstone strong pattern of wavy lines in petrified sand dunes are exposed by erosion, Vermilion Cliffs National Monument, Colorado Plateau, Utah

Yva Momatiuk & John Eastcott / Small sandstone canyon carved by water, exposes strong pattern of parallel lines, Vermilion Cliffs National Monument, Colorado Plateau, Utah

Yva Momatiuk & John Eastcott / Colorful sandstone patterns of lines, ridges and ripples, carved by erosion, are reflected in rainwater pool, Vermilion Cliffs National Monument, Colorado Plateau, Utah

Tim Fitzharris / Lenticular clouds over Mt Dana, Mt Gibbs and Mammoth Peak reflected in flooded Tuolumne Meadows, Yosemite National Park, California

Yva Momatiuk & John Eastcott / Mustang (Equus caballus) mare and her foal flee danger in cloud of dust in the summer season, Wyoming

Tim Fitzharris / Common Porcupine (Erethizon dorsatum) portrait, Montana

Yva Momatiuk & John Eastcott / Mustang (Equus caballus) pair of spring foals, Wyoming

Tom Vezo / Purple Martin (Progne subis) and Tree Swallow (Tachycineta bicolor) mixed group perching on branch, Crane Creek, Ohio

Tim Fitzharris / Mt Moran and String Lake, Grand Teton National Park, Wyoming

Tim Fitzharris / Snow-covered peaks in the San Juan Mountains, Colorado

Tim Fitzharris / Teton Range at Snake River Overlook, Grand Teton National Park, Wyoming

Bob Barbour / Terry Simms, Santa Cruz, California

Bob Barbour / Terry Simms, central coast, California

Bob Barbour / Surfer know as 'Wingnut, ' Santa Cruz, California

Bob Barbour / Josh mulcoy, December 1997, central coast, California

Bob Barbour / Omar Etcheverry, October 1997, central coast, California

Bob Barbour / Sean Hayes, March 1998, Rocky Point, Oahu, Hawaii

Gerry Ellis / Rough-skinned Newt (Taricha granulosa) portrait, Siskiyou National Forest, Oregon

Gerry Ellis / Gas effluence pouring out of smoke stacks at nuclear power plant, upper Ohio River, Ohio

Gerry Ellis / Temperate rainforest with moss covered trees and ferns, Queets River Valley, Olympic National Park, Washington

Jim Brandenburg / Ice crystals, Lake Superior, Michigan

Tim Fitzharris / Gypsum dunes, Guadalupe Mountains National Park, Texas

Tim Fitzharris / Common Porcupine (Erethizon dorsatum) feeding on fruit, Montana

Tim Fitzharris / Everglades and palm trees, Fakahatchee State Preserve, Florida

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) friendly singer, Maui, Hawaii - notice must accompany publication; photo obtained under NMFS permit 987

Mark Moffett / Fire Ant (Solenopsis geminata) nest showing large queen, workers and pupa, Florida

Jim Brandenburg / Cottontail Rabbit (Sylvilagus aquaticus) yawning, South Dakota

Tim Fitzharris / Mexican Golden Poppy (Eschscholzia glyptosperma), New Mexico

Tim Fitzharris / Rufous Hummingbird (Selasphorus rufus) juvenile feeding on flowers, New Mexico

Tim Fitzharris / Waves crashing on Point Dume Beach, California

Jim Brandenburg / Common Sunflower (Helianthus annuus), South Dakota

Jim Brandenburg / Coneflower (Echinacea sp) field, Wisconsin

Michael Quinton / Common Raven (Corvus corax) checking out tourist, Yellowstone National Park, Wyoming

Norbert Wu / California Bigeye Octopus (Octopus californicus) deep sea species swimming, California

Michael Quinton / Common Raven (Corvus corax) using its beak to open a snowmobile's storage compartment in search of food, Yellowstone National Park, Wyoming

Jim Brandenburg / Morning Glory pool in Upper Geyser Basin, Yellowstone National Park, Wyoming

Jim Brandenburg / Sunset over shell covered beach, Sanibel Island, Florida

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) tails and sailboat with whale watching tour, Hawaii

Jim Brandenburg / Frost covered meadow, Minnesota

Tui De Roy / White Tern (Gygis alba) hovering in search of nest site, Midway Atoll, Hawaii

Shin Yoshino / Early morning on the Yellowstone River, Yellowstone National Park, Wyoming

Larry Minden / Collared Lizard (Crotaphytus collaris) holding itself up off of hot rocks, Mojave Desert, California

Jim Brandenburg / Snowy Egret (Egretta thula) flying over water, Ding Darling National Wildlife Refuge, Florida

Norbert Wu / Spotted Ratfish (Hydrolagus colliei) deep sea fish, Monterey, California

Flip Nicklin / Spinner Dolphin (Stenella longirostris) jumping, Hawaii

Norbert Wu / Giant Pelagic Jellyfish (Pelagia panopyra) many animals are associated with this poisonous floating object, Monterey, California

Jim Brandenburg / Creek and waterfall, Northwoods, Minnesota

Jim Brandenburg / Lake with fall colored leaves, Minnesota

Jim Brandenburg / Mushrooms growing on log, Northwoods, Minnesota

Jim Brandenburg / Summer rain, Northwoods, Minnesota

Flip Nicklin / Coral and schooling fish, Gray's Reef National Marine Sanctuary, Georgia

Flip Nicklin / Garibaldi (Hypsypops rubicundus) juvenile, California

Norbert Wu / Northern Anchovy (Engraulis mordax) school, feeds by straining water through gills, California

Flip Nicklin / Coral and schooling fish, Gray's Reef National Marine Sanctuary, Georgia

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) underwater, Hawaii

Jim Brandenburg / Oak (Quercus sp) leaves in stream with snowy forest, Minnesota

Jim Brandenburg / Farm house and tree-lined road in winter, Minnesota

Jim Brandenburg / Temperate forest interior with trillium ground cover, Northwoods, Minnesota

Flip Nicklin / Purple Sea Urchin (Strongylocentrotus purpuratus) with tube feet extended into water to feed, California

Flip Nicklin / Spinner Dolphin (Stenella longirostris) pair surfacing, Hawaii

Fred Bavendam / Horseshoe Crab (Limulus polyphemus) group crawling ashore on the high tides of spring to lay their eggs in Delaware Bay's sandy beaches, New Jersey

Fred Bavendam / West Indian Manatee (Trichechus manatus) named Sadie has propeller cuts on the tail, but her calf remains intact, every year boats kill dozens of manatees, Kings Bay, Crystal River, Florida

Tim Fitzharris / West Temple, Zion National Park, Utah

Tim Fitzharris / Mount Moran and String Lake, Grand Teton National Park, Wyoming

Tim Fitzharris / Rock formations, Muddy Mountains, Valley of Fire State Park, Nevada

Tim Fitzharris / Lake Mead, Lake Mead National Recreation Area, Nevada

Tim Fitzharris / Tower Fall, Yellowstone National Park, Wyoming

Tim Fitzharris / Hot spring near Fountain Lake, Yellowstone National Park, Wyoming

Tim Fitzharris / Laurel Creek, Great Smoky Mountains National Park, Tennessee

Tim Fitzharris / Laurel Creek, Great Smoky Mountains National Park, Tennessee