Barks in the night lead to the discovery of new species

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“Sometimes a keen ear is as important as a sharp eye.” After noticing that the calls of tree hyraxes ー small, herbivorous mammals ー were distinctly different on the opposite side of the Niger River, scientists discovered that what they thought was one species of hyrax were actually two. The newly discovered species, Dendrohyrax interfluvialis, barked in the night; quite unlike the shrieking calls of its neighbours across the river.
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