About 65 million years ago, a meteorite with a width of about 16 km hit the Yucatan Peninsula in Mexico today, causing great disaster. At that time, two-thirds of the animal species on the earth, including dinosaurs, were extinct, and the golden age of reptiles ended. Primitive mammals survived the disaster for a long time and then evolved rapidly. About 50 million years ago, primates evolved rapidly in a radial way, and then they were differentiated from lower primates (such as lemurs and tarsiers) to higher primates (namely apes, such as macaques, golden monkeys, baboons and apes). (Note: Australopithecus China in China is even older than the early higher primates, and basically belongs to the early primitive monkeys. In other words, the so-called Australopithecus in China is actually an ape, a branch of humans and apes. ) 33 million to 24 million years ago, monkeys (narrow nose suborder) in the Old World gave birth to apes. The earliest ape discovered in Egypt (30 million years ago); Egyptian ape (Aegyptopithecus, 26-28 million years ago) has some characteristics of anthropoid ape. Later fossils include forest apes (23 million-10 million years ago), which are widely distributed and found in Asia, Europe and Africa. The primitive Kangxiuer ape in East Africa (130,000 years ago-120,000 years ago) is already an ape, and it is the ancestor of human beings and African apes. The above apes are all forest-dwelling animals, walking on all fours, belonging to the tree-climbing apes. There are two kinds of apes in existence, namely African apes (gorillas, chimpanzees and humans) and Asian apes (gibbons and orangutans). There is a clear boundary between the two groups, and the differentiation between them obviously occurred between 654.38+0.2 million years ago and 654.38+0.5 million years ago. From about 6.5438+million years ago to about 3.8 or more than 2 million years ago, there are two kinds of transitional fossils. One is Lamarcinopithecus, and the other is Australopithecus (many people think Lamarcinopithecus is the ancestor of orangutans. In the past, there were deviations in repairing jaw fragments and tooth analysis. Therefore, Lamarcosaurus, as a fossil representative of the transitional period, is only relatively reasonable.