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Published online 2 April 2004 | Nature | doi:10.1038/news040329-16
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Strong-arm tactics drove creatures from the pond
Fossil find shows our underwater ancestors could do press-ups.
The discovery of an ancient arm bone has helped scientists understand what happened as water-dwelling creatures evolved into land animals.
The three-inch arm bone, found in Pennsylvania and belonging to a 370 million-year-old freshwater animal, has characteristics that indicate it was part of a much stronger limb than previously thought.
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