water-witch

noun3

1. •
   A grebe (Podicipedidae spp.)
2. •
   In particular, a pied-billed grebe (Podilymbus podiceps).

   • The Hell Diver seen was probably the Pied Bill Grebe, […] it surely is a water witch and has disappeared. — 1901
3. •
   (dialect, UK) A storm petrel.