Matthias Breiter / Polar Bear (Ursus maritimus) yearling cub, Hudson Bay, Manitoba, Canada

Scott Leslie / Frog egg mass, Nova Scotia, Canada

Suzi Eszterhas / Polar Bear (Ursus maritimus) lone yearling on shore, Churchill, Manitoba, Canada

Suzi Eszterhas / Polar Bear (Ursus maritimus) three to four month old cub peeking over mother's body while she is tranquilized by researchers, vulnerable, Wapusk National Park, Manitoba, Canada

Mitsuaki Iwago / Harp Seal (Phoca groenlandicus) resting on snow, Gulf of St Lawrence, Canada

Michio Hoshino / Polar Bear (Ursus maritimus) profile, Churchill, Manitoba, Canada

Michio Hoshino / Harp Seal (Phoca groenlandicus) mother surfacing at ice hole to tend to her newborn pup, Gulf of St Lawrence, Canada

Yva Momatiuk & John Eastcott / Red rubber boat with two expedition members circle floating iceberg, summer season, Labrador Sea, Labrador, Canada

Yva Momatiuk & John Eastcott / Iceberg melting and floating south in Labrador Sea current, summer season, Labrador Sea, northern Labrador, Canada

Thomas Mangelsen / Polar Bear (Ursus maritimus) cub with paw over eyes, nestled in mothers' chest, Wapusk National Park, Manitoba, Canada

Tim Fitzharris / Pond reflecting Nisling Range, Yukon Territory, Canada

Michio Hoshino / Polar Bear (Ursus maritimus) pair on snowfield, Churchill, Manitoba, Canada