Until last year, armadillos were thought to be the only living mammals with a protective coat of armor made from bone. Then, a nation-wide effort to CT scan 20,000 museum specimens led to the discovery that a strange group of rodents, called spiny mice, had independently come up with the same trick. But unlike armadillos, spiny mice keep their armor hidden away beneath the skin of their tales, which are uncharacteristically detachable. Tail loss is so common in some spiny mouse species that nearly half the individuals of a given population have been shown to lack them in the wild.
So why bother with the armor? The answer, according to Florida Museum researcher Ed Stanley, has to do with their skin, which is both incredibly fragile and capable of regenerating twice as fast as other rodents. Read more
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