The back feet of some frogs provide a slower landing following a leap due to webbing that may give the frog some gliding ability.

Edit Hook

References

"Caught in mid-air by the camera, this leaping frog has webbed feet which it uses for swimming. Like the duck, the frog is pushed forward from behind: compare the powerful back legs and their webbed feet with the slender front legs and webless front feet. When landing after a leap through the air, the webbing may also serve as a parachute to slow the descent." (Foy and Oxford Scientific Films 1982:181)

Book
The grand design: Form and colour in animalsBLA Publishing Limited for J.M.Dent & Sons Ltd, Aldine House, LondonAugust 4, 1983
Sally Foy

Edit References

Learn More about the living system/s