Few people know that appearing around 81a million years ago, huge tyrannosaurs were the ancestors of small and medium size. The remains of small members of the family of tyrannosaurids are found extremely rarely, and their age is estimated at 150 million years. Researchers believe that such a rarity is associated with an increase in sea level, which flooded the continents and destroyed the bones and other traces of their existence. Fortunately, some skeletons were still not flooded and destroyed - for example, the remains of two Tyrannosaurs of the species Suskityrannus hazelae.
Bones were found at the bottom of the Zuni River,located in New Mexico. The ancestors of huge tyrannosaurs were only one meter tall, and took an evolutionary place between the oldest and smallest representatives of the species and all known predatory giants. The new discovery confirmed the theory that tyrannosaurs evolved from small dinosaurs and for some reason have grown dramatically and become bloodthirsty.
It is believed that small, medium and largetyrannosaurs had one, even more ancient ancestor, but scientists would hardly ever be able to dig up his bones. Meanwhile, the weight of the average ancestors reached 20-40 kilograms, and they died in adolescence. It is believed that they would hardly have become larger and harder - they definitely would not have succeeded in reaching the weight of huge 7,000-pound tyrannosaurs. With all this, they were quite dangerous - the shape of the jaw indicates a high bite force.
How does tyrannosaurids so quicklyincreased in height and weight, for scientists remains a big mystery. Perhaps the secret, as always, lies in climate change, which literally can make animals become stronger and more thirsty.
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