George Sanker / North American river otter (Lontra canadensis) swimming with head above water. Acadia National Park, Maine, USA. November.

Sven Zacek / Wild boar (Sus scrofa) swimming with head above water in Suur Emajogi River. Alam-Pedja Nature Reserve, Tartumaa, Southern Estonia. November.

Pedro Narra / Hippopotamus (Hippopotamus amphibius) with head raised above water surface, Bijagos Archipelago Biosphere Reserve, Guinea Bissau,

Andy Trowbridge / Grey Seal (Halichoerus grypus) at rest on submerged rock, head and one flipper above water. Shetland Islands, Scotland, UK. July.

Roy Mangersnes / Polar bear (Ursus maritimus) holding piece of ice after licking off freshwater, Spitsbergen, Svalbard, Norway, August

LYNN M. STONE / Bullfrog (Rana catesbeiana) with head sticking out above water in pond, Deep River, Connecticut, USA, July

Andy Rouse / 2020VISION / European river otter (Lutra lutra) swimming with head above water, river, Dorset, UK, November

Robert Thompson / Lighthouse on Fanad Head at sunset, County Donegal, Republic of Ireland, UK, August 2011

Hermann Brehm / Young Tigress (Panthera tigris), 22 month, being frightened by a dead leaf. Banghavgarh National Park, India, April.

Edwin Giesbers / Two Malaysian box turtles (Cuora amboinensis) with heads above water, Sarawak, Borneo, Malaysia

Alex Mustard / Caribbean Reef Shark (Carcharhinus perezi) portrait in blue water above a coral reef. Grand Bahama, Bahamas. March

Alex Mustard / A domestic pig (Sus scrofa domestica) swimming in the sea. Exuma Cays, Bahamas. Tropical West Atlantic Ocean. This family of pigs live on this beach in the Bahamas and enjoy swimming in the sea.