Lovely and Colorfull Bird Background Wallpapers

Lovely and Colorfull Bird Background Wallpapers

Bird photo wallpaper

Bird photo wallpaper

Bird photo wallpaper

Bird photo wallpaper

Bird photo wallpaper

Bird photo wallpaper

Bird photo wallpaper

Bird photo wallpaper

Bird photo wallpaper

Bird photo wallpaper

Bird photo wallpaper

Bird photo wallpaper

Bird photo wallpaper

Bird photo wallpaper

Bird photo wallpaper

Bird photo wallpaper

Bird photo wallpaper

Bird photo wallpaper

Bird photo wallpaper

Bird photo wallpaper

Bird photo wallpaper

Bird photo wallpaper

Bird photo wallpaper

Bird photo wallpaper

Bird photo wallpaper

Bird photo wallpaper

Bird photo wallpaper

Bird photo wallpaper

Bird photo wallpaper

Bird photo wallpaper

Bird photo wallpaper

Bird photo wallpaper

Bird photo wallpaper

Bird photo wallpaper

Bird photo wallpaper

Birds - Birds Background Wallpapers


Birds, feathered, winged, warm-blooded, egg-breeding, vertebrate animals. The most crowded tetrapod vertebrates form about 10,000 living species. From the North Pole to the South Pole, they live in all the ecosystems on Earth. Sizes vary from 5 cm in bee flies to 2.7 m in ostriches. According to the fossils found, birds come from dinosaurs in the Jurassic Period, about 150-200 million years ago.

The first known bird is Archeopteryx, which lived about 155-150 million years ago in the Jurassic period. Birds have some characteristics different from other living worlds. It is the first constant-temperature living thing. As a distinctive feature, all of its members are covered with feathers, which are not seen in any other animal group. The frontal members are turned into wings and the bones in the rear members are arranged to form intertarsal joints. Where trachea and bronchi are found, there are very advanced sound boxes. They leave hard-shelled eggs and incubate. The embryo is surrounded by egg shells and amniotic membranes. Birds have full functioning, complex and developed, large and small circulatory systems.
Evolution of birds

Birds, reptiles and close relatives. For this reason, Sauropsida, together with reptiles, are collected in the upper class. Diapsid are derived from Archosauria, especially in Triassic, from the largely differentiated Thecondonti. Pseudosuchia in this latter group is assumed to be the closest group to Dinosauria birds in relation to this.

The oldest fossil bird is Archeopteryx, found in the upper Jurassic (140 million years) layers of Solenhofen (West Germany). In 1860, for the first time a single telek, in 1861, except for the head, a complete skeletal system was found a complete fossil. This fossil was found to create a sensation in the scientific world. Because it carries both fossil, reptile and bird characteristics to the same extent. The fossil is described by HV Meyer as Archeopteryx lithographica and placed at the British Museum in London. There is plenty of evidence that birds evolved with the evolution of dinosaurs; These are similarities in the air cavities in the bones, the chest, the similarities in the wing-to-frontal extremity structures, and the similarity in the dinosaur skeleton structures of the wishbone found only in birds today. In addition, with the development of genetic science,
anatomy

The lack of real teeth, the lack of glands in the skin, the presence of scales in the hairless parts, the attachment of the skull to the backbone, and the well-developed breastbone are features that are rarely seen in other living things. However, the red blood cells are oval and the lungs are more efficient to use the air. The kidneys are of the metanephrosis type and the drainage channels are opened. Except for ostriches, there are no cessation of urine. The waste product is solid uric acid. They have a pair of testicles and they open the cloaca. They are separate sex lives. The mating organ (penis) is absent except for some species (geese, ducks). The ovaries are telophyte-type and exhibit mellobacterium development. Internal fertilization is always seen. Twelve pairs of nerves out of his brain. Visual organs have developed much better than other sense organs. The sense of smell is partially blunted.


Behaviours


The phalaenoptilus nuttallii species sleep in winter.


In birds, behavior has become more complicated, depending on the brain's development. In particular, communication with the voice has improved. The ability to imitate the voice of a creature other than man is found only in birds. Sound analyzes are used as a criterion in species separations. Behaviors related to feeding, courting, attacking and protecting differ from species to species.

Hibernation


As a rule, birds do not sleep in winter sleep except for the Cobanaldatans (Caprimulgiformes). Phalaenoptilus nuttallii does not reduce body temperature to 70 ° C during winter sleep.

Migration


Migratory birds


Immigration in birds means passing a certain period of the year away from where you hatch. Walking birds are birds that partly diverge in different directions from the hatchery. Indigenous birds are the birds that remain in the hatching area. There are transition form groups among all three groups. Migration behavior may occur temporarily in the incubation area with a decrease in nutrients. Birds in the north are known to migrate in cold seasons and by planting leaves. For example, migratory behavior in the north begins in summer because of water ice in places where water birds live or in drought in the south. In most birds, wintering and hatching zones were inherited. Migration is initiated in the spring or summer, partly by external influences.
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