Birds have 2 feet usually with 4 toes on each.They use their feet to walk and hop around and even to catch food.
Flesh eating birds such as eagle and vulture have sharp claws called talons. Using these talons they pick up small animals like mice, rats and toads.
Perching birds such as sparrow have feet to hold on tree branches and sit on them. This is called perching.
Scratching birds such as hen have sharp claws to dig ground for food.