Humans discovered the oldest mammals in the world, and appeared at the same time as dinosaurs of 225 million years ago

Jimu Journalist Hu Li

Humans discovered the oldest mammals in the world. According to CNN reports on September 6, scientists have recently discovered a small creature similar to the world's earliest mammals, which has appeared 20 million years earlier than the Morgen beast discovered before.

Data chart (source: CNN)

Researchers discovered a small creature in Brazil's tooth beasts through fossil tooth records, about 20 cm long, called "Sifang Brazilian Tooth Beast". 225 million years ago, this small creature appeared at the same time as some of the oldest dinosaurs. The discovery of the Brazilian and British scientists has revealed the evolution of modern mammals.

Earlier, Morgan Beast was considered the oldest mammal in the world, and Morgan Beasts first appeared 250 million years ago.

The museum's scientific assistant Martha Richter said: "'The Sifang Brazil tooth Beasts' was previously considered a high -level reptile, but after we conducted a clear inspection of its teeth, we found that it was a mammal. If it is a crawling animal, it will replace the teeth many times in life, and the mammals have only two times to change teeth. "

Richter added: "This is a very small, very small mammal, may be a kind of cave animal."

It is reported that scientists have worked on the "Sifang Brazil tooth Beast" project for more than 5 years. Richter revealed: "These discoveries help us understand the evolution of ecological landscapes and modern mammals in that period."

Smith, a professor of dental biology in London, said: "Their papers have found that they have improved what to define the level of mammals."

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