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Surmising even the physical appearance of a dinosaur - or any extinct animal - based on its fossils is a tricky proposition, with so many uncertainties involved. Assessing a dinosaur's intelligence, considering the innumerable factors contributing to that trait, is exponentially more difficult. A study published last year by Vanderbilt University neuroscientist Suzana Herculano-Houzel that evaluated the intelligence of Tyrannosaurus rex, focusing upon estimated brain size and the number of brain neurons, as comparable to that of primates - specifically a baboon - caused a stir in scient...

The megalodon tooth was found in an unexplored seamount. Click to read more. Megalodon is an ancient shark that went extinct around 2. 6 million years ago but ruled the world's oceans for approximately 20 million years.

Attenborough's long-beaked echidna was last seen more than 60 years ago. Click to read more. Attenborough's long-beaked echidna, a long-thought-extinct animal named after British naturalist David Attenborough, was rediscovered in the Cyclops Mountains in the Indonesian part of New Guinea island.

"People didn't think it could really be done," Marc Friedländer, an associate professor in molecular biology at Stockholm University, told CBS News.

"People didn't think it could really be done," Marc Friedländer, an associate professor in molecular biology at Stockholm University, told CBS News.