アメリカ自然史博物館のインスタグラム(amnh) - 9月5日 12時40分

When sauropods hatched, they generally weighed less than 11 pounds (5 kilograms). Yet in only about three decades, they grew to be adults that were 10,000 times heavier—or more. Such rapid weight gain per year has never been seen in any other land animal, living or extinct. Studies of their bones show the animals initially gained as much as 2 tons each year. Before they were 20 years old, their growth rate slowed, but the animals continued to increase in size until roughly age 30—a decade after reaching sexual maturity.
Photo: ©AMNH/D.Finnin

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