Why some dinosaurs like T Rex were massive while their close relatives were tiny

University of Minnesota/AFP via

The body size of some dinosaurs is not linked to their growth rate, according to a new fossil analysis that sheds light on why some like the mighty predator T rex were massive while their close relatives were tiny.

For long, paleontologists have known that meat-eating dinosaurs called theropods ranged in size from the bus-sized T rex to the smaller, dog-sized Velociraptor.