swimming

Atlantic cod Gadus morhua with curved tail Illustration from “30 Animals that made us smarter” by Patrick Ayree (BBC Books).

Trout swimming Salmo trutta seen from above on a sandy river bottom, demonstrating carangiform movement

Water vole Arvicola amphibius showing how fluffy and formless these creatires are, in profile on sandy bank with background riparian vegetation

Water vole Arvicola amphibius tracks footprints

Water vole Arvicola amphibius pencil sketch of stream bank and a vole swimming underwater emitting air bubbles

Water vole Arvicola amphibius showing how fluffy and formless these creatires are, in profile on sandy bank with background riparian vegetation

Grass snake Natrix natrix

Grass snake Natrix natrix on pile of dead autumn leaves

Grass snake Natrix natrix

Tiger Panthera tigris portrait of a head sketch

Pen and ink Jaguar Panthera onca illustration showing the big cat lounging in a tropical tree looking down at the viewer

Quick watercolour sketch of the Harbour porpoise Phocoena phocoena cut to whtie

Grey seal Halichoerus grypus in profile cut to white

Common or Harbour seal Phoca vitulina lying down with head raised inquisitively

Baikal seal Pusa sibirica cut to white showing mottled skin

Brown trout Salmo trutta view from above showing swimming motion with background of weeds and pebbles

Diagram of different simplified fish shapes