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Mammals first appeared around the Late Triassic (200 MYA), alongside the first true dinosaurs. These animals were small, and lived in burrows, and were probably nocturnal.
For further reading, go to: http://en.wikipedia.org/wiki/Mammal#Evolutionary_history
http://www.earthlife.net/mammals/evolution.html
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When did mammals first appear on earth by paleontologists?
Mammals first appear in the fossil record of the Mesozoic Era.
When did small furry animals appear?
The first mammals appeared during the Cretaceous Period.
What mammals appear on planet earth?
Many mammals appear on planet earth. Here are some of them:oxhumanpigmonkeycatdogfoxwolfantelopeelephantpolar bearhorse
What era did large mammals first appear?
The Cenozoic era at about 65 million years ago. The Paleogene period.
In general the first mammals of any group to appear in the fossil record?
resembled dogs and cats
Did mammals appear in the fossil record before dinosaurs or after?
Mammals actually first came into existence about 220 million years ago, which is about 155 million years before the dinosaurs went extinct, and only about 10 million years after they themselves first evolved. So mammals actually lived alongside the dinosaurs, though played a much smaller role.
Are birds and mammals decended from a common ancestor?
Mammals came before birds. The first mammals lived in the Triassic and the first birds lived in the Jurassic.
When did mammals appear in the mesozoic era?
Mammals appeared in the late Triassic period about 220-230 million years ago.
The most important animal to appear during the Cenozoic era was the?
Mammals is the answer
Are cats older than dinosaurs?
No, dinosaurs existed before mammals. Reptiles and amphibians existed as long ago as 359.2 million years ago, while the first mammals didn't appear until 251 millions years ago.
What era did the humans first appear in?
Humans first appeared in the Paleolithic era, around 2.5 million years ago. This era is characterized by the use of stone tools and the development of early human species like Homo habilis and Homo erectus.
How did hedgehogs appear in the US?
They evolved from earlier mammals. They are native to the states, after all.
