PP Week 6

Bones in birds are hollow structure to minimize the weight. In the cross section, it can be seen how dense the bone is. The same goes for the mouth, instead of having a jaw with teeth, birds have teethless bills. The evolution of birds from reptile has always aimed one goal: flight. The muscle structure of birds are robust and flexible to let the wing generate energy to fly. The triangular system of strut is a structure that prevents chest bones from crushing during flight. Wings are what is known as forelimbs for mammals and birds do have fingers too. However most bone structures found in other organisms are fused in birds. Birds rely more on the muscle and the tendons to support their body to control fine flight adjustments.