Not just tiny arms: T. rex also had super small eyes to accommodate its big bite

The highly effective jaws of Tyrannosaurus rex snapped along with such pressure that they’d splinter the bones of the dinosaur’s prey. But to achieve such a strong bite, the king of the dinosaurs had to make an evolutionary trade-off: It had to accept smaller eyes.

Based on an evaluation of 410 fossilized reptile specimens from the Mesozoic interval (252 to 66 million years in the past), a scientist concluded that T. rex and different flesh-eaters of comparable ilk developed smaller, narrower eyes over time, possible to compensate for his or her bites turning into an increasing number of forceful. In specific, carnivores with skulls longer than 3.2 ft (1 meter) tended to have elongated, keyhole-like eye sockets — or orbits — as adults, whereas the carnivores’ younger offspring and herbivores of all ages had round eye sockets. 

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