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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
What else can I help you with?
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
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.
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.
How did hedgehogs appear in the US?
They evolved from earlier mammals. They are native to the states, after all.
Were pandas the first mammals to be found in Africa?
yes pandas were the first mammals to be found in Africa
Who appeared in fossils first dinosaurs or mammals?
Dinosaurs first appeared shortly before mammals did.
When was the first appearance of land mammals?
The first appearance of land mammals occurred in the late Triassic period.
