Piotr Naskrecki / Milkweed Grasshopper (Phymateus morbillosus) member of the Foam grasshopper family has aposematic coloration, South Africa

Tim Fitzharris / Red Fox (Vulpes vulpes) kit, North America

Tim Fitzharris / Red Fox (Vulpes vulpes) trio of kits peeking out of their den, North America

Tim Fitzharris / Red-eyed Tree Frog (Agalychnis callidryas) three sitting on Heliconia (Heliconia sp), Costa Rica, Digital composite

Tim Fitzharris / Red-eyed Tree Frog (Agalychnis callidryas) climbing on flower, Costa Rica

David Shale / Tentacles of deepsea medusa jellyfish (Atolla manubrium) Gulf of Maine, Atlantic

Ingo Arndt / Scarlet Macaw (Ara macao) close up, portrait, Amazon ecosystem, Peru

Ingo Arndt / Scarlet Macaw (Ara macao) close up, portrait, Amazon ecosystem, Peru

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) three males sitting on a stem, Soberania National Park, Panama

Michael Durham / Honey Bee (Apis mellifera) worker collecting nectar from Red Clover (Trifolium pratense) flowers, note the pollen baskets on the legs, northwest Oregon

Piotr Naskrecki / Spiked Spider (Gasteracantha sp) their abdomen, or opisthosoma, is heavily sclerotized and armed with hard spines possibly to protect against birds and lizards, Solomon Islands

Mark Raycroft / Miniature Long-haired Dachshund (Canis familiaris) puppy sitting on red blanket

Mark Raycroft / Beagle (Canis familiaris) puppy pair on red blanket

Mark Raycroft / Dalmatian (Canis familiaris) on antique fire truck

Nigel Bean / Crimson Waxcap {Hygrocybe punicea} growing in grasslands, Ashton Court, Bristol, UK.

David Shale / (Atolla sp) a deep sea medusa, deep sea Atlantic ocean

Doug Perrine / Red whip coral {Ellisella sp} Bahamas

Mark Raycroft / German Shepherd (Canis familiaris) adult standing with paw on red fire hydrant

Pete Oxford / Red and Green Macaw (Ara chloroptera) flying, wings spread, back view, wild, ranges from humid east Panama to Brazil, east Peru, north-east Bolivia and Paraguay, Cerrado habitat, Mato Grosso do Sul, B...

Pete Oxford / Red and Green Macaw (Ara chloroptera) flying, Cerrado habitat, Mato Grosso do Sul, Brazil

Pete Oxford / Red and Green Macaw (Ara chloroptera) flying, Cerrado habitat, Mato Grosso do Sul, Brazil

Pete Oxford / Red-legged Seriema (Cariama cristata) threat display, Brazil

Pete Oxford / Red-crested Cardinal (Paroaria coronata) perched on branch, Pantanal, Brazil

Michael Durham / Scarlet Macaw (Ara macao) close-up of colorful feathers

Michael Durham / Red-eyed Tree Frog (Agalychnis callidryas) portrait, native to Central and South America

Michael Durham / Red-eyed Tree Frog (Agalychnis callidryas), native to Central and South America

Michael Durham / Red-eyed Tree Frog (Agalychnis callidryas) in rain, native to Central and South America

Michael Durham / Red-eyed Tree Frog (Agalychnis callidryas) in rain, native to Central and South America

Michael Durham / Red-eyed Tree Frog (Agalychnis callidryas) in rain, native to Central and South America

Michael Durham / Red-eyed Tree Frog (Agalychnis callidryas) on flower petal, native to Central and South America

Mark Moffett / Granular Poison Dart Frog (Dendrobates granuliferus) portrait on bird's nest fungus, Corcovado National Park, Costa Rica

Flip Nicklin / Squirrelfish (Holocentrus sp) schooling at reef, Cocos Island, Costa Rica

Flip Nicklin / Squirrelfish (Holocentrus sp) schooling at reef, Cocos Island, Costa Rica

Mitsuaki Iwago / Black Rhinoceros (Diceros bicornis) with Red-billed Oxpecker (Buphagus erythrorhynchus), Serengeti National Park, Tanzania

Mitsuaki Iwago / Red Kangaroo (Macropus rufus) mother embracing joey, Sturt National Park, New South Wales, Australia

Fred Bavendam / Goby (Amblyeleotris sp) keeping watch while a Snapping Shrimp (Alpheus randalli) excavates their shared burrow, Bali, Indonesia

Richard Du Toit / Red-billed Oxpecker (Buphagus erythrorhynchus) on Impala (Aepyceros melampus) male, Kruger National Park, South Africa

Mark Raycroft / Elk (Cervus elaphus) portrait large male

Mark Raycroft / Elk (Cervus elaphus) bull crossing a river

Mark Raycroft / Elk (Cervus elaphus) large bull standing alert in meadow with mountains behind

Mitsuaki Iwago / Black Rhinoceros (Diceros bicornis) mother and baby with Red-billed Oxpeckers (Buphagus erythrorhynchus), Ngorongoro Crater, Tanzania

Michael Quinton / Red Squirrel (Tamiasciurus hudsonicus) four young at entrance to their nest in a tree cavity, Alaska

Michael & Patricia Fogden / Blue-chested Hummingbird (Amazilia amabilis) feeding on nectar from flowers (Hamelia sp) rainforests of Costa Rica

Michael & Patricia Fogden / Bronzy Hermit (Glaucis aenea) hummingbird feeding and pollinating a Perfumed Passion Flower (Passiflora vitifolia) flower, rainforest, Costa Rica

Gerry Ellis / Fly Agaric (Amanita muscaria) highly poisonous mushrooms growing on forest floor, North America

Michael & Patricia Fogden / Green-crowned Brilliant (Heliodoxa jacula) hummingbird juvenile male feeding at and pollinating Ginger (Costus montanus) flowers, Monteverde Cloud Forest Reserve, Costa Rica

Michael & Patricia Fogden / Canal Zone Treefrog (Hypsiboas rufitelus) rainforest, Costa Rica

Claus Meyer / Red-tailed Amazon (Amazona brasiliensis) adult eating fruit, Atlantic Forest ecosystem, Brazil

Claus Meyer / Red-tailed Amazon (Amazona brasiliensis) pair, southern Brazil

Sumio Harada / Red Squirrel (Tamiasciurus hudsonicus) separating seeds from an Engelmann Spruce (Picea engelmannii) cone to store for winter food, Rocky Mountains, Alberta, Canada

Sumio Harada / Red Squirrel (Tamiasciurus hudsonicus) mother returning to her 35 day old babies in nest to nurse them, Rocky Mountains, North America

Sumio Harada / Red Squirrel (Tamiasciurus hudsonicus) climbing tree, Rocky Mountains, North America

Sumio Harada / Red Squirrel (Tamiasciurus hudsonicus) curious 40 day old babies peer out from nest in tree trunk, Rocky Mountains, North America

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

Tim Fitzharris / Elk (Cervus elaphus) male portrait, North America

Tim Fitzharris / Yellow-bellied Slider (Trachemys scripta scripta) turtle, North America

Konrad Wothe / Red Fox (Vulpes vulpes) mother play fighting with kit who has fallen into the lake, North America, sequence 1 of 2

Konrad Wothe / Red Tussock (Chionochloa rubra), South Island, New Zealand

Konrad Wothe / Red Fox (Vulpes vulpes) portrait in winter, North America

Sumio Harada / Red Squirrel (Tamiasciurus hudsonicus) mother nursing her 19 day old babies in nest in tree trunk, Rocky Mountains, North America

Sumio Harada / Red Squirrel (Tamiasciurus hudsonicus) mother nursing her 15 day old babies in nest, Rocky Mountains, North America

Yva Momatiuk & John Eastcott / Red rubber boat with two expedition members circle floating iceberg, summer season, Labrador Sea, Labrador, Canada

Konrad Wothe / Red Wood Ant (Formica rufa) colony reacting in defensive behavior by spraying formic acid from a gland in rear of their abdomens, Sweden

Konrad Wothe / Red Fox (Vulpes vulpes) on rocks with orange lichen, Churchill, Manitoba, Canada

Konrad Wothe / Red-crowned Crane (Grus japonensis) pair foraging in snow, Hokkaido, Japan

Konrad Wothe / Red-crowned Crane (Grus japonensis) pair calling and jumping during courtship, Hokkaido, Japan

Michael & Patricia Fogden / Clark's Coral Snake (Micrurus clarki) venomous snake with warning coloration, rainforest, Costa Rica

Thomas Mangelsen / Elk (Cervus elaphus) in misty waters, Yellowstone National Park, Wyoming

Thomas Mangelsen / Elk (Cervus elaphus) herd of males in snow, National Elk Refuge, Wyoming

Tim Fitzharris / Blanketflower (Gaillardia sp) close-up showing pollen covered anthers and dense pistils in center, North America

Pete Oxford / Chachi Tree Frog (Hyla picturata), Cotacachi-Cayapas Reserve, Ecuador

Tim Fitzharris / Paintbrush (Castilleja sp) and the Organ Rock, Arches National Park, Utah

Yva Momatiuk & John Eastcott / Red Fox (Vulpes vulpes) kit yawning on ridge near den, North Slope, Alaska

Gerry Ellis / Mexican Red-knee Tarantula (Brachypelma smithi), Mexico

Konrad Wothe / Red-eared Slider (Trachemys scripta elegans) turtle, pair in pond, City Park, Munich, Germany

Claus Meyer / Cotton-top Tamarin (Saguinus oedipus), Colombia

Michael & Patricia Fogden / Violet Sabre-wing (Campylopterus hemileucurus) hummingbird male at Ginger (Costus montanus) flowers, Monteverde Cloud Forest Reserve, Costa Rica

Michael & Patricia Fogden / Red-eyed Tree Frog (Agalychnis callidryas) tadpoles in rain water pond, Costa Rica

Michael & Patricia Fogden / Coppery-headed Emerald (Elvira cupreiceps) hummingbird male feeding on and pollinating Shiney Maxillaria (Maxillaria fulgens) in cloud forest, Costa Rica

Michael & Patricia Fogden / Coppery-headed Emerald (Elvira cupreiceps) hummingbird male feeding on and pollinating Shiney Maxillaria (Maxillaria fulgens) in cloud forest, Costa Rica

Gerry Ellis / Red Fox (Vulpes vulpes) kit in log, Aspen Valley, Ontario, Canada

Gerry Ellis / Red Fox (Vulpes vulpes) kit in log, Aspen Valley, Ontario, Canada

Claus Meyer / Red-tailed Amazon (Amazona brasiliensis), Atlantic Forest, Brazil

Gerry Ellis / Lesser Panda (Ailurus fulgens) sitting on tree limb, China, Nepal, Burma

Tom Vezo / Red-tailed Hawk (Buteo jamaicensis) adult rufous morph flying, Sulphur Springs Valley, Arizona

Konrad Wothe / Red-crowned Crane (Grus japonensis) pair calling during courtship dance at their wintering grounds, Hokkaido, Japan

Konrad Wothe / Red-crowned Crane (Grus japonensis) flock feeding in snow, Tsurui Ito Sanctuary, Japan

Michael & Patricia Fogden / Red-eyed Tree Frog (Agalychnis callidryas) on (Heliconia mathiasii) rainforest, Costa Rica

Michael & Patricia Fogden / Black-crowned Central American Squirrel Monkey (Saimiri oerstedii) male in rainforest, Costa Rica

Claus Meyer / Red-breasted Toucan (Ramphastos dicolorus) close-up through vegetation, south Brazil

Claus Meyer / Red Uakari (Cacajao rubicundus) male feeding on fruit, Amazon ecosystem, Brazil

Pete Oxford / Andean Red Fox (Pseudalopex culpaeus) altiplano, Bolivia

Konrad Wothe / Brown Mouse Lemur (Microcebus rufus), Madagascar

Chris Newbert / Parrotfish (Scarus sp) close-up of eye, Red Sea, Egypt

Chris Newbert / Decorator Crab, holding a broken piece of Sea Fan as camouflage, night, Red Sea

Birgitte Wilms / Diana's Hogfish (Bodianus diana) and Soft Coral (Dendronephthya sp), Red Sea, Egypt