Beaks of birds have acquired the present form as a result of adaptation of birds to the surrounding conditions of life and a certain type of food. So, for example, in grainy birds (porridge) they are massive and dull, and insectivorous (hoopoe) – thin and sharp.
Pikas with their long, curved beaks get out of the cracks in the bark of insect trees, and at the base of the broad beak of flyworms there are setae that help birds catch insects in the air. Carnivorous with their sharp ends, their beaks are extracted by a tender family of spiny thistles.
The beaks of the goats are arranged so that they can be opened very widely, because the birds catch insects on the fly. In the fistula is a short, duck-shaped beak, which is convenient to tear off plant food. Stork-shaped birds, differ from each other in the length of their legs and the shape of their beaks, so they do not compete for food. Long-legged species hunt far from shore, long-legged find prey in viscous silt, and those that have short beaks collect food directly from the surface of the water.