How do we know when a species no longer exists in a given area?
The process, as explained by Brian Switek, is grimly fascinating.
Scientists used dogs to find piles of rhino poop between October of
2009 and April of 2010. They found 22 dung piles, but DNA analysis
showed that 17 of those belonged to a single rhino. After that rhino was
killed by poachers, the rhino footprints vanished and no new piles of
scat appeared.
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