Burrowing mammals dig for a living, but how do they do that?

zibba submitted, created time 1 year 1 month (www.eurekalert.org)

Next time you see a mole digging in tree-root-filled soil in search of supper, take a moment to ponder the mammal's humerus bones. When seen in the lab, they are nothing like the long upper arm bones of any other mammal, says Samantha Hopkins, a paleontologist at the University of Oregon.

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