Fossil jawbone (IMAGE)

University of California - Berkeley

Fossil jawbone

Caption

This five-inch segment of fossilized jaw, which was discovered in Antarctica in the 1980s, dates from 40 million years ago. The skull of the bird would have been about two feet long, while the pseudoteeth, which were originally covered with horny keratin, would have been up to an inch long. At this scale, the bird's wingspan would have been 5 to 6 meters, or some 20 feet.

Credit

UC Berkeley image by Peter Kloess

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