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When did mammals become dominant?

Updated: 8/11/2023
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Wiki User

11y ago

Best Answer

Millions of Years Ago

65 + Cenozoic Tertiary Paleocene Mammals become abundant
| . . . after extinction of
| . . . dinosaurs and large
| . . . reptiles; by the
| beginning of the Eocene
60 + rodents and primates
| have evolved
|
|
|
55 +
| Eocene Mammals dominant:
| . rodents, artiodactyls,
| . carnivores, perisso-
| . dactyls (including
50 + horses); whales make
| their first appearance


1 MILLION THE REST IS FALSE ;)
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11y ago
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9y ago

Mammals really began to thrive on Earth about 10 million years ago. This is of course based on the theory of Evolution and not Creationism.

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11y ago

About 50 million years ago. That's only approximate, but it's a lot better than the previous answer.

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11y ago

Mammals became the dominant group of land animals soon after the start of the Paleocene Period, 64 million years ago.

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12y ago

millions of years ago

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Mammals became dominant only after?

after dinsaurs became extinct


During which era did mammals become common?

Mammals became the dominant land animals in the early Paleocene period of the Cenozoic era, after the extinction of the non-avian dinosaurs at the end of the Cretaceous period of the Mesozoic era.


What were the dominant species during the Cenozoic era?

There was no one dominant species throughout the Cenozoic, as it was a period of time that stretched from the extinction of the dinosaurs 65 million years ago to the present day, with many changes in climate that would hinder the ability of any one species to be dominant. However, it is perfectly sensible to say that mammals were dominant since the start of the Cenozoic. Mammals at the time of the dinosaurs (the Jurassic and Cretaceous, mostly) were mostly very small scavengers and herbivores. The extraterrestrial impact and flood basalt outpourings that killed the dinosaurs and many other species left mostly animals under 10kg in weight - chief among them the mammals. With no larger predators to kill them, the mammals took the evolutionary opportunity and flourished, leading us to become the dominant species we are today.


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