Beaks of birds - generally
Birds of all vertebrates have a remarkably low weight in comparison to his body. This is true for several of their characteristics, including the bones filled with air or streamline the shape of the body. These properties are especially needed on the fly, since they make it possible to reduce weight and save energy. Adaptive changes are also noticeable in the construction of the head. Is built with thin-walled bones, and is characterized by smukłymi szczękami and large oczodołami. That their ancestors have been completely reduced, and in their place appeared a strong beaks. The visible part of her bill for us is made up of two shells rogowych, which are connected to the bone in the upper and lower jaw. Each half her bill is also connected with the rest of the skull.