The new research based on genome data shows that birds experienced a "super-species explosion" between 65,438+million years and 65,438+05 million years after the extinction of dinosaurs. Later, more than 654.38+00,000 species of birds called new birds evolved, and 95% of the existing birds came from this new bird class.
Birds are the general name of birds, and they are higher vertebrates that adapt to life on land and in the air. Long feathers can keep the body warm; There are protruding keel processes on the chest, and there are many gaps in the whole body bones, which are full of qi, so they are light; Forelimbs become wings, hind limbs walk, most of them can fly and have a wide range of activities.
Extended data
Birds eat all kinds of food, including nectar, seeds, insects, fish, carrion or other birds. Most birds move during the day, and some birds move at night or dusk.
Flying Most birds can fly, but a few flat-breasted birds can't, especially the birds living on the island, which have basically lost their flying ability.
Birds rarely get lost in flight, no matter how long the journey is. The reason is that they have their own navigation system. During the flight, they will use many things to navigate for themselves, such as landmarks, the angle of the sun, stars, smells and even the geomagnetic field.
Baidu Encyclopedia-Birds (feathered oviparous vertebrates)