A bird it's a vertebrate animal whose main characteristics are: warm blood, lung respiration, body covered by feathers, horny beak without teeth and two wings arranged on the side of its body that are normally used for flight. They also have two hind limbs that allow them to walk, jump, and stand.
Regarding its size, it can range between 6.5 cm. and up to 2.74 meters.
Its differential characteristic when it comes to reproduction is that lay eggs, which will be incubated until the rupture occurs and with it the birth.
The origin of birds dates back to approximately one hundred and fifty-two hundred million years ago and they originated from the bipedal carnivorous dinosaurs of the Jurassic period; After a violent radiation, the evolution that we know today took place and that is how the ten thousand species of today originated.
The habitat of birds is really varied, since They inhabit almost all the biomes that our planet earth has and likewise in all waters, seas, oceans, among others.
Another peculiarity that adds to the several that birds already possess are the behaviors that most species present, among which the following stand out: the aforementioned reproduction through egg-laying; migration to different areas at certain times of the year; association in groups; the communication between them that can be from visual signals, through calls and even original and distinctive songs of each specimen; the developed intelligence; and the transfer of knowledge to subsequent generations.
Regarding the interaction with humans, birds, since their appearance, have had a close relationship with individuals, either as the basis of their economy or their diet, such is the case of poultry, and as accompaniment of people, in this case, parrots, without a doubt, are distinguished as the pet par excellence of many people around the world. Also, they have been used at the request of the manufacture of products (stuffed chairs and pillows) and to decorate some objects.
And on the other hand, the word bird is usually used in common language to refer to that individual who settles for a short period of time somewhere. Juan is a bird of passage in the town, he plans to return to his life in the city.
