the.com/waterbird

means A bird that lives on or around water and is physically built for it — webbed feet, waterproof feathers, the whole kit — like ducks, swans, herons, and gulls.

from A plain compound, just 'water' plus 'bird,' stitched together in English the way we build most of our everyday animal names (songbird, blackbird, seabird). No hidden root or borrowed tale here — it's a transparent description that does exactly what it says, earning its keep through usefulness rather than mystery.