Angelo Gandolfi / Red postman butterfly (Heliconius erato) (above) and Tiger longwing (Heliconius hecale) La Paz Waterfall Gardens, Costa Rica.

Charlie Summers / American Pronghorn Antelope (Antilocapra americana) Doe seeks refuge in a pond during the rut from anxious Buck, Custer State Park, South Dakota, USA

Jack Dykinga / Saguaro {Carnegia gigantea} and Cholla cacti {Opuntia sp} Antelope Hills, Cabeza Prieta National Wildlife Refuge, Arizona, USA

Michael Durham / Pronghorn Antelope (Antilocapra americana) male on grassland, Hart Mountain National Wildlife Refuge, Oregon

Michael Durham / Pronghorn Antelope (Antilocapra americana) male and female on grassland at sunrise, Hart Mountain National Wildlife Refuge, Oregon

Michael Durham / Pronghorn Antelope (Antilocapra americana) male on grassland at sunrise, Hart Mountain National Wildlife Refuge, Oregon