How does the foot structure of a grebe differ functionally from a duck's foot?

Answer

Grebes have lobes of skin protruding from the sides of their toes.

Ducks have classic webbed feet connecting the three forward-facing toes. Grebes, conversely, feature lobes of skin that stick out from the sides of each toe, creating a wide surface area for powerful backward pushes during dives.

How does the foot structure of a grebe differ functionally from a duck's foot?
birdclassificationfamilyduckGrebe