Birds are related to the class of warm-blooded vertebrates that constituting the class Aves. It has feathers and toothless beaked jaws. Birds also lay hard shelled eggs, a high metabolic rate, a four-chambered heart, and a vigorous yet frivolous skeleton. Birds live all over the world and have ranged from 5 cm to 2.75 m, an ostrich. In the world, there are around ten thousand living species, more than half of are perching birds. Nearly all birds have wings that develop and fluctuates according to species; the only recognized classes which don’t have wings are the extinct moa and giant birds.

Dinosaurs and the originality of birds

There is a close relationship between the dinosaurs and the originality of birds. Most researchers admit that birds are related to the subgroup of theropod dinosaurs and, especially, they are members of Maniraptora. A group of theropods which comprises dromaeosaurids and oviraptorosaurs. Recent discoveries in the Liaoning Province of northeast China have demonstrated that many small theropod feathered dinosaurs are contributing to this ambiguity.

Adorable features of birds

The adorable and unique feature of a bird is the ability to fly. Other features are also that make the bird a special creature. Here we shall discuss the adorable and unique features of birds.

The nervous system of birds

The nervous system is an essential component of a living creature. It is large relative to the bird size. In the nervous system, the brain’s most developed part is the one that controls the flight-related functions, the cerebellum manages the movement and, the other part cerebrum controls behavior patterns, navigation, mating and nest building, etc. Most of the birds have a poor smelling sense plus notable exceptions consisting of kiwis, New World vultures, and tubenoses. But The avian vision system is highly developed. Waterbirds got special flexible lenses that let them accommodate for vision in air and water. Some species also have dual fovea.

Wings

Another adorable feature of birds is the wings that almost all birds have, although not all birds can fly. Not only birds but also many mammals and insects have wings. But the birds' bodies are stunningly intended for flight, having strong chest muscles and just enough curve to their wings that assist in the lift. Wings also have various shapes that provide different benefits to the numerous bird species. The slender, sharp-tipped wings of the falcon provide additional speed; albatrosses soar high on wings much extended than they are wide. Furthermore, most songbirds have elliptical, evenly shaped wings that provide ease in small movements in the tight spaces of their tree homes. Swimming birds, like Penguins and puffins, have flipper-shaped wings that push them rapidly and gracefully in the water.

Beak

Mostly all birds have beaks, that are made of a bony core surrounded by a thin layer of keratin. The interesting and unique feature is that birds don’t have true teeth, but several classes have tomia -- sharp edges of their beaks. Birds can’t chew food but they grind or rip it into pieces small enough to swallow. Interestingly, the bird's beak shape indicates the general diet. Meat-eaters like hawks and owls have sharp, hooked beaks tearing the prey. While the strong, cone-shaped beaks assist seed eaters to break through shells. Ducks and geese have broad, flat beaks for straining food from the water.

Toothless jaws

Most of the birds don’t have teeth, in past most of the birds had teeth, but now the modern birds don’t have. The reason is that birds need to be as light as possible to fly effectively and teeth. Maybe teeth add weight to a bird's skull. Similarly, a horny beak is much lighter than any bone.
Several bird species have a beak that is particular that enables a bird to eat certain foods.

Eggs

Naturally, all birds lay eggs, some very colorful or protected with spots. Eggs are not a unique feature to birds, of course, as many other creatures like fish, reptiles, amphibians, and insects also lay eggs. Besides, a bird egg is different in that case that it has a hard shell made mostly of calcium and a layer of hardened mucus. Inside the egg, the developing embryo gets diet from the yolk and albumin, which is egg white. God has bestowed a sense that’s why many birds construct nests to protect their eggs and then care for the eggs and the hatchlings.

Hollow Bones

Another one of the main features of a bird is hollow bones. Many flying creatures have some pneumatic or hollow bones. Some of the air-filled bones in flighted birds include the pelvic girdle, some ribs, the humerus, and the femur. Hollow bones do not comprise upon marrow, the bones have air-filled canals and are supported by crisscrossed supports. Some earth-bound or flightless birds, like penguins and ostriches, have just solid bones. Some dinosaurs also had pneumatic bones like flying birds.

Long-tail birds

Longtails are quite large birds that are measured up to 30 inches including the tail feathers, with wingspans up to 3ft. The feathers are pure white in color having diagonal black bars across each wing. These bars form a V shape, during the flight a bird is viewed from above. Its tail has composed of two extremely extensive feathers, surrounded by other short ones. The Longtail’s sharp, pointed beak is yellow in young birds, that changes into orange.
Many small birds are also famous for their prettiness. They are small birds with long tails that make them more attractive. Like Red-tailed Hawk, Motmot and Superb Lyrebird, etc.

Short tail birds

Many species of birds have a short tail like albatross, a large unique seabird from the Northern Pacific Ocean. Although related to the other North Pacific albatrosses, it also shows behavioral and morphological links to the Southern Ocean albatross. Many other birds like Manakin and shearwater are famous on this list.

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