Scott Leslie / Black-and-white Warbler (Mniotilta varia) male calling in spring, Maine

Scott Leslie / American Lobster (Homarus americanus) feeding on sea urchin, Bonne Bay, Newfoundland, Canada

Brent Stephenson / Sunset off Scott Island, with floating pieces of sea ice, Scott Inlet, Baffin Island, Canadian Arctic, August 2015.

Brent Stephenson / Polar bear (Ursus maritimus) mother and large second year cub swim across calm water, Scott Inlet, Baffin Island, Canadian Arctic, August. Vulnerable species.

Brent Stephenson / Young Polar bear (Ursus maritimus) walking across melting sea ice, Scott Inlet, Baffin Island, Canadian Arctic, August. Vulnerable species.

Brent Stephenson / Male Polar bear (Ursus maritimus) feeding on a first year Polar bear cub it has just killed, Scott Inlet, Baffin Island, Canadian Arctic, August. Vulnerable species.

Brent Stephenson / Male Polar bear (Ursus maritimus) feeding on a first year Polar bear cub it has just killed, Scott Inlet, Baffin Island, Canadian Arctic, August. Vulnerable species.

Scott Leslie / Boardwalk through swamp, Okefenokee National Wildlife Refuge, Georgia

Scott Leslie / Longleaf Pine (Pinus palustris) forest, Okefenokee National Wildlife Refuge, Georgia

Scott Leslie / Florida Jay (Aphelocoma coerulescens), Merritt Island National Wildlife Refuge, Florida

Scott Leslie / American Alligator (Alligator mississippiensis) juvenile, Florida

Scott Leslie / Limpkin (Aramus guarauna) amid curtain of Spanish Moss (Tillandsia usneoides), Florida