'Tree of lice' pinpoints first mammal with a louse infestation - Nature.com

More than 90 million years ago, an adventurous parasite crawled from a bird to an ancestor of modern elephants.

A long-nosed cattle louse (Linognathus vituli; artificially coloured), and egg cases.Credit: Dennis Kunkel Microscopy/SPL There was a time, at least 90 million years ago, when mammals might have bee… [+3721 chars]

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