Birds are classified according to types of birds, being aerial animals, some of them can be wild and their environments are usually in the woods or jungles, we invite you to continue reading to learn more about them. 
Air Medium
It is a medium that should be considered as passing through for most organisms, since some of them are planktonic, the rest only use it for their movement, such as birds, its main advantage lies in the possibilities of avoiding the obstacles that the medium presents. terrestrial, for the displacement or dispersion of an organism, birds can access through the air.
The wings help to overcome orographic accidents, which prevent reaching the mainland or crossing obstacles of nature, the arms of the sea or even the oceans, in this way it has been possible to occupy the oceanic islands, the air environment imposes as a condition physical reduce the body's weight as much as possible, increase the airfoil and develop some means of propulsion.
In other words, that is why birds have wings and their bodies are smaller and lighter, wings have been the universal solution in the aerial environment, there can be both invertebrates and vertebrates, with the only difference being that between vertebrates the wings are covered with feathers, which improves their aerodynamic properties.
The birds
They are oviparous vertebrates, which are characterized by having a light and modified body, for this reason their hind limbs are transformed into wings and the body is covered with feathers.
bird characteristics
Birds maintain their body temperature between 41 and 42 centigrade, thanks to their efficient circulatory and respiratory systems and a highly developed central nervous system.
The feathers and the horny beak are its most outstanding features, the wings are epidermal formations that consist of a rigid central axis, the plumage is constantly shed, however this can vary depending on the type of bird, the beaks are formed by two horny sheaths and They acquire different forms according to the bird's feeding model.
Skeleton muscles of birds
The skeleton of birds is light, compact and rigid, the bones have undergone a process of change, since in many cases the bone marrow has disappeared and the spaces it occupied have been filled with air, the sternum is highly developed and shaped by its anterior part, the keel, which is one of the parts of birds.
The welded clavicles form the typical bone, instead of the birds called furcula, the forelimbs are modified for flight, so that it can be picked up, the legs serve as landing gear and to walk the musculature is very powerful and has concentrate on the center of the body.
Anatomy and physiology
All birds have a tongue, the esophagus usually has a widening called a crop to store food, the stomach has a glandular part that directs food and a muscular part that grinds it, the intestine ends in the cloaca, the lungs have been reduced, while that the bronchial network has given rise to a set of air sacs, which accumulate air inside.
In the lower part of the trachea, they have a sound-producing organ called the syrinx, the circulatory system consists of a heart with two atria and two ventricles, the excretory system is made up of two kidneys connected to the cloaca, by means of two ureters, the birds are together with the faeces a pasty and whitish liquid resulting from the absorption of water from the urine.
Currently, the brain is larger than that of reptiles and the center of vision is larger and more sophisticated. An example of this is owls and barn owls that have night vision.
reproduction and development
This will depend on the type of bird, the reproductive apparatus of males consists of two testicles, that of females with two ovaries, fertilization is always internal, the eggs have abundant yolk known as yolks, to nourish the embryo and a limestone protective shell.
They usually put them in nests and incubate them, that is, they keep them warm until they are born, some chicks are born naked and remain in the nest for a while, fed by their parents, until their feathers come out and they can fend for themselves, others are covered in down and can follow their parents as soon as they are born.
Types of seabirds
Seabirds spend a good part of their lives in the sea, for this reason their lungs are spliced, some like penguins, which of all seabirds is the one that has best adapted to aquatic life, since they carry long travel underwater and have lost the ability to fly, their wings serve as fins for swimming and the tail acts as a rudder.
One of the examples of birds, is the Emperor penguin The male places the eggs on its feet so that they do not touch the ice. Its body is covered by waterproof feathers that protect it from the cold. They also have a thick layer of fat under the skin.
Seabirds generally live on hills to defend themselves from predators of any other danger, they live on cliffs as happens with seagulls that have a hooked beak, long wings and webbed feet, at birth they have a mottled plumage that they lose in the adult stage, they are birds that do not fly high or fast, but they are expert gliders, they are usually seen on the coasts on the cliffs.
Their diet is varied from mollusc fish, eggs and carrion, some go up rivers and reach inland cities attracted by garbage dumps.
Of all the types of seabirds, the albatross is the only one with the longest wings, it is normally considered a migratory bird, not all of them forage for food in the same way as pelicans and gannets, they dive from great heights and dive to capture food, seagulls fish by flying low and as already mentioned, penguins can sink and dive into the depths catching the fish you find while swimming.
Types of birds
You're split in two kinds of birds, the paleognaths and the neognaths, these encompass all living species, they are:
The paleognaths
They group together birds incapable of flight and bands, like running birds, they are made up of five types of birds:
- The ostriches: With two toes on their legs, they can reach up to two meters in height and weigh ninety kilograms. They form large groups associated with herds of herbivorous mammals and the males incubate the eggs.
- Cassowaries and the emu: They have three toes on their legs and vestigial wings reach up to five meters high, they live in Australia and New Guinea.
- The kiwis: They have four toes on their feet and a long beak with nasal openings at the end, about the size of a chicken, they can be seen in New Zealand.
- Rheas: With three toes on their legs and up to a point two meters tall, the males incubate the eggs, form small groups accompanied by herbivorous mammals, live in South America.
- Partridges: They are characterized by their rudimentary wings and a small saddle that allows them to fly briefly, in case of danger, the males also incubate the eggs.
The Neognates
They are flying birds, with highly developed feathers, the types of birds that make up this group are:
- Booby birds or penguins: The wings have transformed into flippers and webbed feet with four fingers, the feathers cover the entire body and they live in the polar regions.
- Petrels, albatrosses, shearwaters and paino: Excellent fliers that have webbed feet, long thin wings, live in all oceans, albatrosses only perch on land to incubate.
- Loons: They are characterized by having a large bill finished with a point and short webbed feet, they are good divers and generally live in the sea.
- Grebes and Grebes: They have webbed fingers, are good divers, and live in fresh water.
- Pelicans, cormorants, gannets and frigatebirds: They have four fingers joined by a membrane and a bag on the neck, they can live both in the sea and in fresh water.
- Storks, spoonbills, flamingos, herons, marabouts, bitterns, ibises: They have long legs and beaks, sometimes webbed feet, they live in or near aquatic environments.
- Ducks, geese, add, swans and geese: They have a broad, flat bill, webbed feet, and a short tail.
- Harpy eagle, falcons, kites, hawks, vultures and condors: With a curved beak and legs with strong claws, they are excellent flyers and gliders, their diet is carnivorous or necrophagous.
- Parrots, macaws, parrots, parakeets, cockatoos: They have a curved beak and pressing legs with two fingers forward and two backwards, their feathers are very colorful and striking.
- Hummingbird: Their wings appear sharp and they are excellent fliers, hummingbirds are the smallest birds that can perform hovering and backward flights.
- Owls and barn owls: Characterized by having a broad head and eyes in a frontal position, a short beak, claws and dense plumage, they are nocturnal predators.
- Pigeons: Usually earthlings, they usually live in cleared land, they can drink liquids without raising their heads.
- Quail, hen, turkey, peacock: They have elongated legs when walking and little ability to fly, their young are nidifugous.
- Toucans and woodpeckers: Its beak is long and pointed, with a protractile tongue, they are all forest birds.
- Nightingales, Chiffchaffs, Chickadees: To this group belong all the birds of paradise, the crows, these birds constitute the most numerous order with about five thousand species that characterize the types of passerine birds, the four fingers are independent and one is arranged backwards, they are well endowed for the I sing, their young are nidicolous.