Classification of birds. Vertebrates Wildlife. Animal Kingdom. Fauna. Zoology.

The grebe, swimming and diving birds excellently adapted for aquatic life, with fluid lines, have long neck and pointed beak are gaviform. In flight his figure resembles a cigar; the fast flapping of the wings is a good indication for its identification.

The somormujos and the zampullines are swimming and diving birds, smaller and chubby than the colimbos, with short beak and blunt and cottony tail. They swim with almost the entire body submerged.
They live in small groups around the world.
The somberujo lavaco performs complicated dances in the mating season.

The order is characterized, among other things, by having the four fingers of the legs together by an interdigital membrane. European cormorants are all predominantly black, marine or inland waters and are extraordinary swimmers, catching fish at depths of up to 30 meters. When they swim they immerse the body a lot, being able to regulate their density in such a way that they can swim even with their heads out of the water, as a periscope.

Long-legged wading birds, fine fingers and long necks, typical of marshes and estuaries. Pointy peak that serves to capture prey. Wide and strong wings; Fast flight, with slow and regular beating.

Birds also striding, with long neck and legs.
The posterior finger is located higher than the previous three and the nail of the middle finger is not pectinated. They lack down plates. They fly with neck and legs stretched.

Family of difficult classification, the flamingos have been grouped sometimes with the geese and the gallinaceae, since they present characters of those groups, although they are, more related, apparently with the ciconiformes.
They have interdigital membranes and are good swimmers; its thick and curved down beak has lamellae at the edges through which the slime filters to procure the small animals and plants it feeds on.

All have webbed feet, with three toes facing forward; The normally spatulated beak is another distinctive feature. The swans are the largest, with a characteristic long neck and white adult plumage.
Geese are somewhat smaller and are identified by the "V" flight and the resonant voice.
The ducks have a short neck and very delayed feet, cause of the characteristic swagger with which they walk. They fly with fast flutter; pointed ends.
The plumage of the ducks is sexually differentiated (in general, that of the male is more colorful), except in the jars, with a very short neck.

Also called raptors; They are characterized by the strong hooked beak to tear the meat, large eyes to locate prey and long legs with strong spurs and sharp nails with which they kill their captures. All raptors have a waxy mass at the base of the beak at which the nostrils open.

Heavy construction, with small head and crow's beak. Rounded and strong wings that allow it to take off almost vertically, with a characteristic crash.

Charadriformes species are grouped according to anatomical characteristics that are not very evident to the observer.
Plovers
This family includes small to medium sized limicolas, whose legs are generally relatively short or at most moderately long.

Long legs with interdigital membrane and relatively long wings.
Adults tend to have white bodies and backs and gray or black wings.
The species are identified by minor details of shape, size and plumage.

Swallows
Smaller than seagulls and shorter beak, thinner wings and shorter legs. They owe their name to the agility with which they fly.
They often hover over water before diving to catch some prey. Smokers also catch insects in wetlands.

Birds of relatively heavy body, small head and not very short neck. Long tail and pointed wings.

Nocturnal, with a single species in Aragon, the barn owl, which differs from owls by its heart-shaped facial disc, its long legs, feathered to the beginning of the fingers and fingernail of the middle serrated finger.

Large round head, characteristic facial disc, hooked beak, round eyes and apparent absence of neck.
The plumage hides the long legs; fingers covered with feathers and strong spurs.
The pitiful voice and night habits make him unmistakable.

Birds with stunted legs, useless for their movements, with the four fingers directed forward and provided with strong nails, suitable for hanging from rocks and walls. In Lower Aragon they receive the generic name of crossbowmen, also frequent as a surname.
They are magnificent flying and feed on aeroplankton.
In general they are not able to trace the flight from the ground, but need to launch from some slope.
The cementation of the nest is based on its sticky saliva, with which agglutinate feathers and straws collected in flight.

Compact birds, with short neck and tail. Long, thick and sharp beak. The three previous fingers are joined in more than 2/3 of its length.
  His colors are bright. They live on the shore of coastal or inland waters and feed on small fish they catch by throwing themselves on water.

Birds of beautiful color, very good flying, that catch insects on the fly.

Medium-sized, brightly colored birds, with the inner and middle fingers welded. They are invertebrate predators or small vertebrates.

This order is the most numerous, with about 5,000 species with many different characters.