They belong to the group of vertebrates, are characterized by feathers covering his entire body, have the ability to maintain body temperature regardless of the weather conditions that particular condition is called homeoterma, their capacity is higher than that of reptiles because they can fly, a characteristic that determines decisively their physiology and anatomy.
The birds along with mammals are the only animals with the ability to maintain a constant body temperature this has enabled them to conquer all the resources of the planet.
Features.
The skin is covered with feathers that are necessary for the regulation of body temperature, and essential to fly.
Plumage :is adapted to particular functions ,pennas composed by the t-shirts are levels of lift and tail feathers on the
tail directed the course of the flight, the wing coverts or blankets lining throughout the body that covers the face are
called perdos ,down (below the wing coverts) are an excellent thermal insulator .Generally used to fly but some
species ,to stay afloat in the water.
The plumage is sealed by an oily substance that secretes the uropygial gland situated in the same bird is responsible
for spreading with its beak.
Color: is determined by two main melanin pigments (colors black and brown), carotenes(for the range from yellow to red)also the refraction of the light also influences. The albinism in birds is caused by defective production of pigments.
Peak: this is a case horny composed of upper and lower jaws or jaw are at the base of the nostrils, this serves to feed themselves, they do not have teeth so swallow their food whole; the peaks can vary depending on your diet, for example the parrots have a sharp peak which can crack the soft or hard fruits on its surface, the hummingbird has a peak in the form of pipe to be able to extract the nectar of the flowers.
There is a great variety of species and are classified according to their species in :
First order consumer Hebivoros, carnivorous consumers of second order and third order. Within the first order we have Granivores feed on grains and seeds. Frugivores feed on fruits.
The second order are insectivores these insects, larvae, worms.
The higher-order are carnivorous, feeding on fish, small rodents and other birds ,the scavengers eat meat from dead animals and the omnivorous that eat of all .
How ARE INSIDE THE BIRD?
Heart :has four chambers, two atria and two ventricles separated by a intraauriculares and intraventricular septum.
Lungs: an organ that is responsible for exchanging oxygen for carbon dioxide in the blood they do this through the pulmonary alveoli, the lungs are connected with the air sacs are accessories that allow them to store air which used the birds at the time of fly are located on its wings are inflated like a balloon and facilitates the flight and range between 6 and12.
The Legs: This part of the birds is very important because depending on the mode of life of the bird and the requirements you need according to its species as well are endowed by ,example if they have to hold on to a tree to sleep need legs that can sustain them and do not fall as well the bird are asleep; in the case of hunting need claws to hold its prey.
