Claudio Contreras / Tres Marias Rabbit (Sylvilagus graysoni). Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, July. Endangered.

Claudio Contreras / Mexican / Brown Vine Snake (Oxybelis aeneus) with mouth open. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, June.

Patricio Robles Gil / Resplendent quetzal (Pharomachrus mocinno) male dissapearing into nest hole in tree, El Triunfo biosphere reserve, Sierra Madre del Sur, Chiapas, Mexico

Patricio Robles Gil / Resplendent quetzal (Pharomachrus mocinno) male at entrance to nest hole in tree, showing very long tail feathers, cloud forest El Triunfo biosphere reserve, Sierra Madre del Sur, Chiapas, Mexico

Patricio Robles Gil / Resplendent quetzal (Pharomachrus mocinno) male perched, El Triunfo biosphere reserve, Sierra Madre del Sur, Chiapas, Mexico

Patricio Robles Gil / Resplendent quetzal (Pharomachrus mocinno) male at nest hole in tree, El Triunfo biosphere reserve, Sierra Madre del Sur, Chiapas, Mexico

Patricio Robles Gil / Resplendent quetzal (Pharomachrus mocinno) male at nest hole in tree, El Triunfo biosphere reserve, Sierra Madre del Sur, Chiapas, Mexico

Tim Laman / Jumping spider (Salticidae) in Sierra Madre National Park, Luzon, Philippines. September

Tim Laman / Frog {Rana similis} Sierra Madre National Park, Luzon, Philippines

Jack Dykinga / Clusters of Barrel Cacti (Ferocactus stainesii) and Yuccas (Yucca sp) with the Sierra Madre in the background, Chihuahuan Desert, Mexico, Central America

Jack Dykinga / Red-barked Gumbo Limbo (Bursura simaruba) amid Oil Nut Plants (Orbygnia guaycoyule) in the jungle of the Sierra Madre Foothills, Jalisco, Mexico, Central America

Jack Dykinga / Cactus (Acanthocereus tetragonus) amid flowering Flaveria (Flaveria anomala) and Pink Floss Plant (Ageratum sp), Laguna Madre, Mexico, Central America

Jack Dykinga / Agave (Agave montana) in mountain habitat in the Sierra Madre Oriental range, Nolina (Nolina sp), Madrone and Pine (Pinus sp) also present, Tamaulipas, Mexico

Jack Dykinga / Close-up of Agave (Agave montana) with red thorns / spines and interesting patternation on blades, Sierra Madre Oriental mountain range, Tamaulipas, Mexico

Luiz Claudio Marigo / Red bellied macaw at nest in dead palm tree {Ara manilata} Madre de Dios, Peru

Luiz Claudio Marigo / Moriche palm trees beside Sandoval Lake, Madre de Dios, Peru

Luiz Claudio Marigo / Moriche palm trees {Mauritia flexuosa} beside Sandoval Lake, Madre de Dios, Peru

Pete Oxford / Monkey-slug caterpillar {Phobetron sp} mimics tarantula spider. Rainforest, Madre de Dios, Peru

Patricio Robles Gil / Guayalejo River flowing through cloud forest, Tamaulipas, Sierra Madre Oriental, northeast Mexico

Patricio Robles Gil / Fog rolling over cloud forest, Altas Cumbres Protected Area, Tamaulipas, Sierra Madre Oriental, northeast Mexico

Patricio Robles Gil / Accumulated rainwater on a Mafafa leaf in El Cielo Biosphere Reserve in the mountains of the Sierra Madre Oriental, Tamaulipas, northeast Mexico

Pete Oxford / Scarlet macaws {Ara macao macao} Madre de Dios, Amazonia, Peru

Pete Oxford / Scarlet macaw {Ara macao macao} Madre de Dios, Amazonia, Peru

Pete Oxford / Two Scarlet macaws {Ara macao} perched in rainforest, Madre de Dios, Amazonia, Peru

Pete Oxford / Rainbow over Madre de Dios River, Peru.

Pete Oxford / Hot lips plant flower {Psychotria poeppigiana} rainforest Madre de Dios, Peru, South America

Pete Oxford / Saddleback tamarin {Saguinus fuscicollis} feeding on Combretum assimile tree flowers/fruit, Madre de Dios rainforest, Peru, South America

Pete Oxford / Red howler monkey in canopy {Alouatta seniculus} rainforest Madre de Dios, Peru

Pete Oxford / Emperor tamarin {Saguinus imperator} in rainforest tree, Madre de Dios, Peru

Pete Oxford / Passon fruit flower and fruit forming {Passiflora sp} Madre de Dios, Peru

Pete Oxford / Green winged macaws perched by salt lick. Madre De Dios River, Peru, Amazon, South America

Martha Holmes / Herd of white-lipped peccaries (Tayassu pecari) crossing the Alto Madre de Dios river, Amazon basin. Peru.

Claudio Contreras / Paper Wasp (Polistes sp.) on nest cells. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, September.

Claudio Contreras / Tropical Parula (Parula pitiayumi graysoni) feeding chick. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, October.

Claudio Contreras / Night Snake (Hypsiglena torquata) on leaf litter. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, June.

Claudio Contreras / Gray Sac-winged Bat (Balantiopteryx plicata). Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, June.

Claudio Contreras / Elegant / Coppery Tailed Trogon (Trogon elegans). Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, June.

Claudio Contreras / Northern Cardinal (Cardinalis cardinalis) with prey. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, September.

Claudio Contreras / Northern Mockingbird (Mimus polyglottos) with invertebrate prey. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, September.

Claudio Contreras / Parrot Snake (Leptophis diplotropis) portrait. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, September.

Claudio Contreras / Parrot Snake (Leptophis diplotropis) portrait. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, September.

Claudio Contreras / Western Spiny-tailed Iguana (Ctenosaura pectinata) juvenile. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, August.

Claudio Contreras / Ladder-backed Woodpecker (Picoides scalaris). Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, August.

Claudio Contreras / Tropical Parula (Parula pitiayumi graysoni) with prey. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, August.

Claudio Contreras / Boa (Boa constrictor sigma) camouflaged against leaf-litter. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, July.

Claudio Contreras / Boa (Boa constrictor sigma). Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, July.

Claudio Contreras / Yellow-headed Parrot (Amazona oratrix tresmariae), portrait. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, July. Endangered.

Claudio Contreras / Boa (Boa constrictor sigma) on branch. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, July.

Claudio Contreras / Yellow-headed Parrot (Amazona oratrix tresmariae), feeding on mangoes. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, July. Endangered.

Claudio Contreras / Western Spiny-tailed Iguana (Ctenosaura pectinata) juvenile. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, August.

Claudio Contreras / Elegant / Coppery Tailed Trogon (Trogon elegans), Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, July.

Claudio Contreras / Clouded Anole Lizard (Anolis nebulosus) on leaf, demonstrating gecko-like climbing abilites. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, July.

Claudio Contreras / Common Mexican Treefrog (Smilisca baudinii) calling with inflated throat sacs. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, August.

Claudio Contreras / Common Mexican Treefrog (Smilisca baudinii) calling with inflated throat sacs. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, August.

Claudio Contreras / Robber Fly (Diogmites sp.) hanging from leaf, feeding on fly prey. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, August.

Claudio Contreras / Ladder-backed Woodpecker (Picoides scalaris) feeding from flower. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, July.

Claudio Contreras / Ladder-backed Woodpecker (Picoides scalaris) foraging on trunk. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, July.

Claudio Contreras / Western / Mexican Spiny-tailed Iguana (Ctenosaura pectinata) among flowers. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, June.

Claudio Contreras / Tropical Parula (Parula pitiayumi graysoni) singing from flowered perch. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, June.

Claudio Contreras / Cinnamon Hummingbird (Amazilia rutila graysoni). Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, June.

Claudio Contreras / Cinnamon Hummingbird (Amazilia rutila graysoni). Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, June.

Claudio Contreras / Streak-backed oriole (Icterus pustulatus graysonii) perched on mango. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, June.

Claudio Contreras / Streak-backed Oriole (Icterus pustulatus graysonii) perched on mango it is feeding on. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, June.

Claudio Contreras / Yellow-headed Parrot (Amazona oratrix tresmariae) in foliage. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, June. Endangered.

Claudio Contreras / Boa (Boa constrictor sigma) in strike-ready pose. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, June. Captive.

Claudio Contreras / Boa (Boa constrictor sigma) in strike-ready pose. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, June. Captive.

Claudio Contreras / Tropical Parula (Parula pitiayumi graysoni) feeding on flowers. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, June.

Claudio Contreras / Cinnamon Hummingbird (Amazilia rutila graysoni) feeding at flower. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, June.

Claudio Contreras / Yellow-headed Parrot (Amazona oratrix tresmariae). Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, June. Endangered.

Claudio Contreras / Central American Indigo Snake (Drymarchon corais melanurus). Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, October.

Claudio Contreras / Central American Indigo Snake (Drymarchon corais melanurus). Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, October.

Claudio Contreras / Grayson's Thrush / Rufous-backed Robin (Turdus graysoni / rufopalliatus). Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, June.

Claudio Contreras / Mexican Parrotlet (Forpus cyanopygius) feeding. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, October.

Claudio Contreras / Turkey Vulture (Cathartes aura) interacting with Crested Caracara (Caracara plancus). Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, September.

Claudio Contreras / Toad (Incilius / Bufo mazatlanensis). Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, October.

Claudio Contreras / Pallas's Long-tongued Bat (Glossophaga soricina). Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, June.

Claudio Contreras / Long-billed Dowitcher (Limnodromus scolopaceus) foraging in mud. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, October.

Claudio Contreras / Gray Sac-winged Bat (Balantiopteryx plicata) clinging to rock. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, September.

Claudio Contreras / Western / Mexican Spiny-tailed Iguana (Ctenosaura pectinata) on flowering cactus. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, September.

Claudio Contreras / Great Fruit-eating Bat (Artibeus lituratus) roosting on trunk. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, September.

Claudio Contreras / Sheep Frog (Hypopachus variolosus). Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, September.

Roland Seitre / Flock of Cobalt-winged Parakeet (Brotogeris cyanoptera) feeding on clay which provides some minerals they require. Madre de Dios, Peru, September.

Roland Seitre / Flock of Cobalt-winged Parakeet (Brotogeris cyanoptera) and Black-capped Parakeet (Pyrrhura rupicola) in shade under tree. Madre de Dios, Peru, September.

Roland Seitre / Ocelot (Leopardus / Felis pardalis) in shade beneath tree. Madre de Dios, Peru, September.

Roland Seitre / Ocelot (Leopardus / Felis pardalis) in profile. Madre de Dios, Peru, September.

Roland Seitre / Ocelot (Leopardus / Felis pardalis), climbing through undergrowth. Madre de Dios, Peru, September.

Roland Seitre / Ocelot (Leopardus / Felis pardalis) with Cobalt-winged Parakeet (Brotogeris cyanoptera) it has batted from the air. Madre de Dios, Peru, September. Sequence 4 of 4.

Roland Seitre / Ocelot (Leopardus / Felis pardalis) with Cobalt-winged Parakeet (Brotogeris cyanoptera) it has batted from the air. Madre de Dios, Peru, September. Sequence 3 of 4.

Roland Seitre / Ocelot (Leopardus / Felis pardalis) stalking after parakeet it has knocked from the air; blurred parakeet flies overhead. Madre de Dios, Peru, September. Sequence 2 of 4.

Roland Seitre / Ocelot (Leopardus / Felis pardalis) at base of tree stalking parakeets. Madre de Dios, Peru, September. Sequence 1 of 4.

Oriol Alamany / Trekker, Eulalia Vicens, with Mount Fitz Roy or Chalten (3405 m) and Madre Lagoon in the background, Los Glaciares National Park, The Andes, Patagonia. Argentina, January 2006

Patricio Robles Gil / Resplendent quetzal (Pharomachrus mocinno) female perched in tree, El Triunfo biosphere reserve, Sierra Madre del Sur, Chiapas, Mexico

Patricio Robles Gil / Resplendent quetzal (Pharomachrus mocinno) female at entrance to nest hole in tree, El Triunfo biosphere reserve, Sierra Madre del Sur, Chiapas, Mexico

Patricio Robles Gil / Resplendent quetzal (Pharomachrus mocinno) female at entrance to nest hole in tree, El Triunfo biosphere reserve, Sierra Madre del Sur, Chiapas, Mexico

Patricio Robles Gil / Resplendent quetzal (Pharomachrus mocinno) female at entrance to nest hole in tree, El Triunfo biosphere reserve, Sierra Madre del Sur, Chiapas, Mexico

Patricio Robles Gil / Resplendent quetzal (Pharomachrus mocinno) female at entrance to nest hole in tree, El Triunfo biosphere reserve, Sierra Madre del Sur, Chiapas, Mexico