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But dinosaurs didnât appear until about 230 million years ago. Mammals first appeared around that same time. The first human-like animal, or hominid, dates to about 4.5 million years ago, but modern humans only date back perhaps 60,000 years.And recorded civilization has lasted only about 5,000 years.ammals first appeared around that same time. The first human-like animal, or hominid, dates to about 4.5 million years ago, but modern humans only date back perhaps 60,000 years. And recorded civilization has lasted only about 5,000 years.
No one really knows for sure what the first mammal was, but there are two top contenders for the title: the Megazostrodon and the M â¦ organucodon. Both are believed to have lived around 200 million years ago and the species are closely related. 2 people found this useful.he first mammal to orbit the earth was the dog Laika on November 3 1957 in the Soviet satellite Sputnik 2. which was not designed for her retrieval. Unfortunately Laikia died about six hours after launch.