An absolute unit.
They used 3D models derived from a cast of Kumimanu's colossal femur to determine that the "monster bird" weighed 340 pounds. Determining its height proved more difficult and uncertain, but the researchers estimate that it stood at a stout 5 feet 2 inches. Meanwhile, the smaller penguin, named Petradyptes, weighed in at 110 pounds. For comparison, the largest extant penguin, the Emperor penguin, grows only to four feet tall — at most — and some 88 pounds.
In addition to making them untouchable, Ksepka added, their hefty sizes may have made them more proficient deep sea divers that could stay warmer for longer, like in seabirds.
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