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 scientific circles.
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.