examples of bills
A bill’s shape is characteristic of the lifestyle of the bird species. Its main function is to allow the bird to feed, to construct its nest and to defend itself.
aquatic bird 
Bird with webbed feet for ease of swimming.
insectivorous bird 
The long thin pointed bill allows the bird to catch insects in flight.
granivorous bird 
The short sturdy conical bill is used to hull seeds: the sharp lower mandible cracks the seed, which the tongue holds in place on the upper maxilla.
wading bird 
The long curved bill allows the bird to extract small animals and plants buried deep in the ground, in mud and in marshes.
bird of prey 
The short sturdy hooked bill tears apart large prey.