These are certain amphibians which can live on land and water with same expertise eg.some animals have swimming mode of locomotion in water and jumping habit on land.They use their hind limb for swimming in place of tail fin as in case of aquatic amphibians. Aquatic adaptations found in these Anurans are as follows-
1)Compact boat shaped body.
2)Highly developed powerful muscles in hind limbs for effective swimming strokes.
3)Webbed hind limb digits.