Green sea turtle swimming underwater

Adapted to swimming

Adaptations for swimming enables animals to move around in water. Animals that can swim proficiently (natatorial) fall into three categories. Those that evolved in water (for instance sharks and jellyfish), those that had land living ancestors but have returned to an aquatic life (dolphins and manatees) and those that split their time between water and land (penguins, crocodiles) and need to move around efficiently in both mediums. Animals that simply go for a swim now and then - say to cross a river - are not specifically adapted to swimming, though this behaviour may be of interest.

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Animals with this behaviour

Mammals

Birds

Reptiles

Amphibians

Cartilaginous fish

Ray-finned fishes

Lobe-finned fishes

Lampreys

Cephalopods

Insects

Merostomata

Jellyfish

Bivalvia

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