Heather Angel / Ornamental koi carp (Cyprinus carpio) group with open mouths at lake surface. Xishuangbanna Tropical and Flowers Garden, Jinghong, Yunnan, China.

Edwin Giesbers / European ground squirrel / Souslik (Spermophilus citellus) approaching photographer's feet, Gerasdorf, Austria. April.

Pascal Kobeh / Young Northern elephant seal (Mirounga angustirostris) in very shallow water, Guadalupe island, Mexico. Pacific Ocean.

Robin Chittenden / Common chub (Squalius cephalus) shoal gasping for air at water's surface in partially frozen ditch, Whitlingham Coiuntry Park, Norfolk, England, UK. December.

Robin Chittenden / Common chub (Squalius cephalus) shoal gasping for air at water's surface in partially frozen ditch, Whitlingham Coiuntry Park, Norfolk, England, UK. December.

Shane Gross / Atlantic cod (Gadus morhua) juvenile held by researchers from Department of Fisheries and Oceans Canada after implanting a radio tag to track the fish's movements. Newfoundland, Canada. May 2019.