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The birds, which evolved from the feathered dinosaurs in the Theopod group, are the only surviving dinosaurs according to the classics. The closest relatives of birds are crocodiles. Ancient bird-like dinosaurs that lie outside the class Aves proper, in the wider group Aviale, date back to the Middle Jurassic period some 170 million years ago. It retains the primitive characteristics of many early "stem-birds", such as archeopteryx, teeth, and long bone tails. DNA-based evidence found that birds dramatically diversified during the Cretaceous - Paleogene extinction event million 66 million years ago, which destroyed the tyrosaurs and all non-avian dinosaur lineages. But birds, especially those in the southern continent, survived the event and then migrated to other parts of the world while diversifying during the period of global cooling.
Some birds, especially corvids and parrots, are the smartest animals; Many bird species make and use tools, and many social species pass on the knowledge to generations, which is considered a form of culture. Many species migrate at great distances each year. Birds are social, interact with visual cues, calls and songs, and participate in cooperative breeding and behavior such as hunting, flocking and hunting. Most species of birds are socially (but not necessarily sexually) monogamous, usually for one breeding season at a time, sometimes for years, but rarely for life. Other breeds have breeding systems that are multifaceted (one male with many females) or, rarely, polygamous (one female with many males). Birds produce offspring that are fertilized by sexual reproduction. They are usually laid in the nest and served by parents. Most birds have an extended parental care period after hatching.
Many species of birds are economically important as raw material in the food and production of human consumption, with domestic and domestic birds being important sources of eggs, meat and feathers. Songbirds, parrots and other species are popular as pets. The guano is harvested for use as a fertilizer. The number of birds throughout human civilization. About 120 to 130 species have been extinct due to human activity since the 17th century, and hundreds more before that. Human activity threatens the extinction of about 1,200 bird species, though efforts are underway to rescue them. Entertainment birdwatching is an important part of the ecotourism industry
Eves and a sister group, Order Crocodylia, are the only surviving representatives of the reptile clade Archosauria. During the late 1990s, Aves was phylogenetically defined as all the descendants of the most recent common ancestor of modern birds and Archeopteryx lithographica. However, the earlier definition suggested by Jack Gauthier gained widespread currency in the 21st century, and is used by many scientists who adhere to the Philocode system. Gauthier defined the Eves to include only the crown group of a set of modern birds. This was done simply by excluding most of the known fossils from the fossil, and by assigning them,
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The birds, which evolved from the feathered dinosaurs in the Theopod group, are the only surviving dinosaurs according to the classics. The closest relatives of birds are crocodiles. Ancient bird-like dinosaurs that lie outside the class Aves proper, in the wider group Aviale, date back to the Middle Jurassic period some 170 million years ago. It retains the primitive characteristics of many early "stem-birds", such as archeopteryx, teeth, and long bone tails. DNA-based evidence found that birds dramatically diversified during the Cretaceous - Paleogene extinction event million 66 million years ago, which destroyed the tyrosaurs and all non-avian dinosaur lineages. But birds, especially those in the southern continent, survived the event and then migrated to other parts of the world while diversifying during the period of global cooling.
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Many species of birds are economically important as raw material in the food and production of human consumption, with domestic and domestic birds being important sources of eggs, meat and feathers. Songbirds, parrots and other species are popular as pets. The guano is harvested for use as a fertilizer. The number of birds throughout human civilization. About 120 to 130 species have been extinct due to human activity since the 17th century, and hundreds more before that. Human activity threatens the extinction of about 1,200 bird species, though efforts are underway to rescue them. Entertainment birdwatching is an important part of the ecotourism industry
Eves and a sister group, Order Crocodylia, are the only surviving representatives of the reptile clade Archosauria. During the late 1990s, Aves was phylogenetically defined as all the descendants of the most recent common ancestor of modern birds and Archeopteryx lithographica. However, the earlier definition suggested by Jack Gauthier gained widespread currency in the 21st century, and is used by many scientists who adhere to the Philocode system. Gauthier defined the Eves to include only the crown group of a set of modern birds. This was done simply by excluding most of the known fossils from the fossil, and by assigning them,
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