What is a Bird? Birds are reptile like animals that maintain a constant internal body temperature. They have an outer covering of feathers; two legs that are covered with scales and are used to walking or perching; and front limbs modified into wings.
Feathers Feathers are made mostly of protein and develop from pits in the birds skin. ---------->
Paleontologists agree that birds evolved from extinct reptiles.
Evidence for this hypothesis is provided by many embryological, anatomical, and physiological characteristics shared by modern birds and living reptiles.
Forms, function, and Flight
Birds have a number of adaptations that enable them to fly. These adaptations include highly efficient digestive, respiratory, and circulatory systems; aerodynamic feathers and wings; strong, lightweight bones; and strong chest muscles.
Body temperature Control
Animals that can generate their own body heat which is called endotherms.
Endotherms, which include birds , mammals, and some other animals, have high rates of metabolisms compared to ectoderms such As reptiles.
Any body heat that a birds loses must be gained by eating food. The more food a bird eats, the more heat energy its metabolism can generate.
In fact, the title “eats like a bird” it is quite misleading, because most birds are voracious eaters.
Also the birds feeding process
Birds that eat insects or seeds, however, have a muscular organ called the gizzard that helps in the mechanical breakdown of
The crop is located at the lower end of the esophagus. Food is stored and moistened in the crop as well.
Birds have a unique and highly efficient way of taking in oxygen and eliminating carbon dioxide.
Air sacs: when a bird inhales, most air enters large posterior air sacs in the body cavity and bones.
The Systems Circulation: Birds have four chambered hearts and two separates circulatory loops. Excretion: The excretory system of many birds are similar to those of most living reptiles. Response: Birds have well-developed since organs, which are adaptations that enable them to coordinates the movement required for flight. Movements: Birds that can not fly,getaround mostly by walking, running and sometimes swimming. Reproduction: In birds, both male and female reproductive tracts open into the cloaca.