Artist's rendering of the hypothetical placental ancestor, a small insect-eating animal. / Carl Buell

Artist's rendering of the hypothetical placental ancestor, a small insect-eating animal. / Credit: Carl Buell

Including humanitymammalianA research paper that supposed that his ancestor was a quadruped rat animal that eats insects was announced by the National Science Foundation on February 7.

In the six years of international research, we analyzed a large amount of data including genetic and physical characteristics of various species of modern and prehistoric times and reproduced the detailed genealogy of evolution of mammals.
Among them, we focus on placental mammals including human beings, horses, whales and so on.

In the hypothesis that has been widely accepted, 70% of all species including the dinosaurs on Earth have disappeared It was thought that various placental mammals existed before mass extinction.

This shrew-sized Cretaceous-age mammal was uncovered in the Gobi Desert. / AMNH/S. Goldberg, M. Novacek

This shrew-sized Cretaceous-age mammal was uncovered in the Gobi Desert. / Credit: AMNH / S. Goldberg, M. Novacek

Photo,Gobi desertWas found inCretaceousA small mammal.

According to this newspaper, after 200,000 to 400,000 years since dinosaurs are extinct, small placental mammals have started to branch into various species, and have come to have amazing diversity.

Whereas the conventional theory was based only on genetic data, in this study we have succeeded in drawing more detailed evolution history of placental mammals by combining genetic evidence, anatomy, and evidence left by fossils I will.

Be the main authorNew York - Stony Brook UniversityOf Maureen O'Leary (Maureen O'Leary) AndAmerican Museum of Natural History, As a particularly important finding, states that the branch point of evolution could be identified as the extinction of dinosaurs.

Mammals explain that "Rodents and primates were not coexisting with dinosaurs except birds, but soon after the extinction of the dinosaurs, they wandered around and bifurcated from small animals that had eaten insects." .


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