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Tyrannosaurus rex was only a small child compared to a bird from the Galapagos Islands weighing 33 grams, research showed.
Pound-for-pound, the bite of the great earthly feather of Galapagos is 320 times stronger than his eighth-ton-wide distant cousin of dinosaurs.
Scientists have discovered that supercomputers used to analyze the bite of 434 living and dead species, including birds, mammals and reptiles.
The Galapagos large earth teeth had the strongest bite of all body sizes.
Its thick beak contains an impressive 70 Newtons force that is well used for breaking open walnuts and breaking the seeds.
Long six centimeters, the depth is approximately equal to the size of one of the teeth, such as tees similar to T. rex.
But eight-dimensional dinosaurs would have no chance of birds if they had both the same size, scientists said.
"The image of T. Rex with its violent jaws helped it to become the most iconic dinosaur, but our research showed that its bite was relatively unimportant. The bite was not what gave T. Rex a evolutionary advantage, as it was previously assumed, "Chief researcher dr. Manabu Sakamoto of the University of Reading said.
"Large predators such as T. Rex could create enough bite forces to destroy their prey and crush the bone only by being large, not because they had a disproportionately strong bite."
The research also shows that human intelligence could have led us to such a bad bite compared to other animals, scientists said.
The development of the big brain assumed a space that would otherwise be filled with muscles that are critical to hard biting.
The study, published in the journal Royal Society Proceedings B, found that the power of the bite of most animals developed in proportion to the evolutionary changes in body size.
Accelerated outbreaks of bluetongue evolution were observed in some animals, such as Galapagos, a large tooth that developed the phenomenal power of the beak in less than a million years.
Evolutionary reductions in bite power were more frequent than an increase, researchers said.
This is especially true for people whose bite strength has rapidly decreased, although their bodies have increased over time.
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