examples of feet
The feet of birds are adapted to their lifestyle. They usually have four toes: one posterior (the hind toe) and three anterior.
aquatic bird 
Bird with lobed toes for ease of swimming.
lobate toe 
Each of the flat toes surrounding the lobes; they provide propulsion in the water and prevent slipping out of the water.
lobe 
Each of the round cutaneous divisions encircling the toes that allow the bird to swim.
bird of prey 
Poorly adapted to locomotion, these sturdy powerful legs have talons to grip prey, immobilizing and killing it.
talon 
Very curved and pointy corneous structure allowing the bird to seize its prey.
scale 
Each of the small hard thin scales covering the toes in layers.
perching bird 
The four toes end in a nail, which wraps around a support when the bird is resting; the hind toe provides equilibrium.
hind toe 
First toe of the foot, facing backward and providing equilibrium.
toe 
The terminal end of the legs formed of articulated bones allowing the bird to perch or walk.
aquatic bird 
The large flat bill, with corneous lateral plates, filters water and mud to extract food.
web 
Fine membrane of skin connecting the digits of the foot; it stretches when the bird swims.
webbed toe 
Each of the digits of the foot, connected by membranes; when spread, they make swimming easier.