webbed feet

Beavers Castor canadensis with beaver dam.  Illustration based in Tierra del Fuego, where introduced beavers have damaged the closed ecosystem. Illustration from The Hidden Universe: Adventures in Biodiversity by Alexandre Antonelli

Emegent head of the Giant otter Pteronura brasiliensischewing on a recently captured fish

Mute swan Cygnus olor standing on one grey leg and clearly showing its orange beak