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 / Aerial view of Tamul Waterfall (330 feet high) where Rio Gallinas cascades into the Rio Santa Maria river in the Huasteca Potosina region, Mexico

Flip Nicklin / Blue Whale (Balaenoptera musculus) aerial view of an 80 foot individual, Sea of Cortez, Mexico

Norbert Wu / Hotels lining beach, Cancun, Mexico

Norbert Wu / Sandbank along coast, Isla Mujeres, Mexico

Norbert Wu / Reef on coast, Isla Mujeres, Mexico

Norbert Wu / Mangrove (Rhizophora sp) forest with underground river surfacing near coast, Yucatan Peninsula, Mexico

Norbert Wu / Mangrove (Rhizophora sp) forest with underground river surfacing near coast, Yucatan Peninsula, Mexico

Pete Oxford / Red Mangrove (Rhizophora mangle) roots provide nursery for Schoolmaster (Lutjanus apodus) young, Sian Ka'an Biosphere Reserve, Quintana Roo, Mexico

Richard Herrmann / Photographer in desert during wet spring, Sonora, Mexico

Kevin Schafer / Isla Espiritu Santo, Sea of Cortez, Baja California, Mexico

Patricio Robles Gil / Mountains of Sierra del Carmen tower 5,000 feet over the Chihuahuan Desert floor, Sierra Madre Range, Mexico

Kevin Schafer / Small motorboat anchored off of island, Sea of Cortez, Baja California, Mexico

Ingo Arndt / Monarch (Danaus plexippus) butterfly overwintering areas that have been destroyed by illegal logging, Michoacan, Mexico

Ingo Arndt / Monarch (Danaus plexippus) butterfly overwintering areas that have been destroyed by illegal logging, Michoacan, Mexico

Ingo Arndt / Monarch (Danaus plexippus) butterfly overwintering areas that have been destroyed by illegal logging, Michoacan, Mexico

Ingo Arndt / Monarch (Danaus plexippus) butterflies in trees, El Rosario, Michoacan, Mexico

Ingo Arndt / Monarch (Danaus plexippus) butterfly overwintering site in highland forest, Michoacan, Mexico

Ingo Arndt / Monarch (Danaus plexippus) butterfly overwintering site in highland forest, Michoacan, Mexico

Patricio Robles Gil / Pine (Pinus sp) forest overlooking Sierra del Carmen region, Coahuila, Mexico

Patricio Robles Gil / Sierra del Carmen mountain range towers 5,000 feet over the desert floor, Mexico

Patricio Robles Gil / Sierra del Carmen mountain range towers 5,000 feet over the desert floor, Mexico

Patricio Robles Gil / Striking cliffs in Serranias del Burro region, Coahuila state, Mexico

Patricio Robles Gil / Rio Grande flowing through arid landscape in the Sierra del Carmen region, Mexico

Patricio Robles Gil / Rio Grande flowing through arid landscape in the Sierra del Carmen region, Mexico

Patricio Robles Gil / Mountains of Sierra del Carmen tower 5,000 over the desert floor and the Rio Grande, eastern Sierra Madre Range, Mexico

Patricio Robles Gil / Mountains of Sierra del Carmen tower 5,000 over the desert floor, eastern Sierra Madre Range, Mexico

Patricio Robles Gil / Sierra del Carmen mountain range towers 5,000 feet over the desert floor, Mexico

Patricio Robles Gil / Sierra del Carmen mountain range towers 5,000 feet over the desert floor, Mexico

Patricio Robles Gil / Rio Grande running through arid landscape of the Sierra del Carmen region, Mexico

Patricio Robles Gil / Snow Goose (Chen caerulescens) aerial view of large flock flying over water during migration, Tamaulipas, Mexico

Patricio Robles Gil / Sand dunes, El Gran Desierto de Altar, El Pinacate, Gran Desierto de Altar Biosphere Reserve, Sonora, Mexico

Patricio Robles Gil / El Elegante Crater is 1400 meters wide and 140 meters deep, El Pinacate, Gran Desierto de Altar Biosphere Reserve, Sonora, Mexico

Patricio Robles Gil / The peak of Las Virgenes Volcano, 1,920 meters high, El Vizcaino Biosphere Reserve, Baja California, Mexico

Patricio Robles Gil / Volcan de las Virgenes and Volcan Del Azufre, El Vizcaino Biosphere Reserve, Baja California, Mexico

Patricio Robles Gil / Pronghorn Antelope (Antilocapra americana) aerial view of herd running through the Vizcaino Desert, Baja California, Mexico

Patricio Robles Gil / Mountains in San Pedro Martir National Park, Baja California, Mexico

Patricio Robles Gil / Picacho Del Diablo, the highest peak in Baja California at 3,000 meters, San Pedro Martir National Park, Mexico

Patricio Robles Gil / The Sierra San Pedro Martir mountains, northern Baja California, Mexico

Patricio Robles Gil / Tortugas Island, Gulf of California, Mexico

Patricio Robles Gil / Espiritu Santo Island, Gulf of California, Mexico

Patricio Robles Gil / Espiritu Santo Island, Gulf of California, Mexico

Patricio Robles Gil / Sperm Whale (Physeter macrocephalus) aerial view of two swimming near the surface in the Gulf of California, Mexico

Patricio Robles Gil / Sperm Whale (Physeter macrocephalus) aerial view of two swimming near the surface in the Gulf of California, Mexico

Patricio Robles Gil / Espiritu Santo Island, Gulf of California, Mexico

Patricio Robles Gil / Mountains covered with dense cloud forest, El Cielo Biosphere Reserve in the mountains of the Sierra Madre Oriental, Tamaulipas, northeast Mexico

Patricio Robles Gil / American White Pelican (Pelecanus erythrorhynchos) flock in coastal lagoon, northern Laguna Madre, Tamaulipas, Mexico

Patricio Robles Gil / Aerial view of Tamul Waterfall (330 feet high) where Rio Gallinas cascades into the Rio Santa Maria river in the Huasteca Potosina region, Mexico

Patricio Robles Gil / Aerial view of Aldama sinkholes or cenotes, vertical caves filled with mineralized fresh water, Tamaulipas, Mexico

Patricio Robles Gil / Aerial view of Aldama sinkholes or cenotes, vertical caves filled with mineralized fresh water, Tamaulipas, Mexico

Patricio Robles Gil / American White Pelican (Pelecanus erythrorhynchos) flock landing in coastal lagoon, northern Laguna Madre, Tamaulipas, Mexico

Patricio Robles Gil / Shoreline of the northern Laguna Madre, one of the largest wetlands in Mexico, Gulf of Mexico, Tamaulipas, Mexico

Patricio Robles Gil / Shoreline of the northern Laguna Madre, one of the largest wetlands in Mexico, Gulf of Mexico, Tamaulipas, Mexico

Flip Nicklin / Fin Whale (Balaenoptera physalus) aerial view of pair, Baja California, Mexico

Flip Nicklin / Blue Whale (Balaenoptera musculus) aerial view of an 80 foot individual, Sea of Cortez, Mexico

Theo Allofs / Coastal lagoon, Quintana Roo, Yucatan, Mexico

Theo Allofs / Coastal lagoon, Quintana Roo, Yucatan, Mexico

Theo Allofs / Coastal lagoon, Quintana Roo, Yucatan, Mexico

Theo Allofs / Coastal lagoon, Quintana Roo, Yucatan, Mexico

Patricio Robles Gil / American Bison (Bison bison) aerial of running herd, Sierra del Carmen region, Mexico

Patricio Robles Gil / Santa Clara Mountains, El Vizcaino Biosphere Reserve, Baja California, Mexico

Tui De Roy / Wind patterns in sand dunes, Magdalena Island, Baja California, Mexico

Patricio Robles Gil / American White Pelican (Pelecanus erythrorhynchos) flock in coastal lagoon, northern Laguna Madre, Tamaulipas, Mexico

Patricio Robles Gil / Aerial view of the silted Pedregoso River in the Sierra Madre, Tamaulipas, northeastern Mexico

Patricio Robles Gil / Waterfall in the Sierra Tamaulipas, one of few pristine tropical areas in northeastern Mexico