Alex Mustard / Southern stingray (Dasyatis americana) two swimming over sand bar, under stormy sky. Grand Cayman, Cayman Islands. British West Indies.

Mark Raycroft / Pronghorn Antelope (Antilocapra americana) running in winter, North America

Mark Raycroft / Pronghorn Antelope (Antilocapra americana) running in winter, North America

John Chan / American avocet (Recurvirostra americana) foraging in salt marsh, Southern California, USA.

Nick Hawkins / American lobster (Homarus americana) in eelgrass (Zostera marina). Nova Scotia, Canada. July

Marie Read / American avocet (Recurvirostra americana), adult in breeding plumage foraging by sweeping its bill from side to side through shallow water, Orange County, California, USA, April.

Marie Read / American avocets (Recurvirostra americana) two during aggressive (territorial) encounter, Bear River Migratory Bird Refuge, Utah, USA, May.

Jeff Foott / Pronghorn Antelope (Antilocapra americana) male in grassland, Wind Cave National Park, South Dakota

Donald M. Jones / American Avocet (Recurvirostra americana) pair courting, Montana

Robert Thompson / Great tiger moth (Arctia caja americana) Lac-Drolet, province, Quebec, Canada November

David Perpinan / Rhea (Rhea americana) incubating eggs, gets up and turns one over, Pantanal, Mato Grosso do Sul, Brazil.

Alex Mustard / Southern stingray (Dasyatis americana) swimming over sand in shallow water, split level photo with blue sky and clouds. The Sandbar, Grand Cayman, Cayman Islands. British West Indies. Caribbean Sea.