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Extinct Era on Instagram: "Fossil embryos from Montana and Alberta suggest that tyrannosaur hatchlings were already about a meter long and only a few kilograms in weight. Even at this stage, they carried the proportions of a predator, with relatively large heads, developing jaws, and tiny serrated teeth. Bone studies show that T. rex went through a rapid adolescent growth spurt, gaining several hundred kilograms each year during its teenage years. This growth pushed them from small, fragile hatc