All of us have heard about the various species under threat of extinction and loads of efforts are being made to help them survive. But many such species have already disappeared off the face of Earth...they are extinct.

Here are some of those amazing creatures that won't be seen again:





Tyrannosaurus Rex (Extinct about 65 million years ago)

T. Rex is surely the first that comes to mind when you think of 'extinct animals'.



Tyrannosaurus rex was one of the largest land carnivores of all time; the largest complete specimen, measured 12.8 metres (42 ft) long, and was 4.0 metres (13 ft) tall at the hips. Mass estimates have varied widely over the years, from more than 7.2 metric tons (7.9 short tons), to less than 4.5 metric tons (5.0 short tons), with most modern estimates ranging between 5.4 and 6.8 metric tons (6.0 and 7.5 short tons).

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