A water bird, specifically a type of coot with a distinctive bald or white head patch.
From 'bald' plus 'coot,' where coot comes from Middle English and Old English 'cote,' a common water bird; the bald- prefix describes its appearance.
Medieval and early modern people just looked at nature and made up compound names—a bald-looking coot became 'baldicoot,' no fancy Latin needed! It's one of the most charmingly literal animal names ever.
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