Bird PNG Images
Birds are the common name of vertebrate animals covered with feathers, breathing lungs, warm-blooded, egg-laying, beaked, winged, bipedal, warm-blooded, vertebrate and egg-reproducing animals.
They make up the most numerous tetrapod vertebrates, with around 10,000 living species. They live in all ecosystems on earth, from the North Pole to the South Pole.
It is a large class of vertebrates. There are no teeth in their beaks. Today, there are about 10,000 species living on land and in water. Most are volatile. There are also rare flightless varieties such as kiwi and ostrich. All of them are warm-blooded and four-eyed in heart. The major and minor circulation are completely separated from each other. Usually, their body temperature is 41-42 °C. Their skin is covered with feathers and feathers. Feathers retain body heat. They do not have glands in their skin. Only at the base of the tail there is a pair of glands that secrete oil. It is overdeveloped in those living near water. Their legs are covered with keratin scales. Their feet are four-toed, three in front and one in the back.
