WASHINGTON, June 23 (Reuters) - At least 11 species of African frogs carry a built-in concealed weapon -- they can sprout claws on demand to fight off attackers, U.S. researchers reported on Monday.
CAMBRIDGE, Mass., June 23, 2008 – Biologists at Harvard University have determined that some African frogs carry concealed weapons: When threatened, these species puncture their own skin with sharp ...
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