nuthatch/ˈnʌtˌhæt͡ʃ/EtymologyFrom Middle English nutthache, notehache, nuthake, nuttehake, nothak, equivalent to nut + hatch (akin to hack). Compare English nutcracker. Compare typologically Polish kowalik (akin to kować).nuthatch means any of various small passerine birds from the genus Sitta, found throughout the northern hemisphere and noted for their unusual proclivity for climbing down trees head first. Lexicurio rates it Sui generis — a strength score of 86 out of 100.nuthatch is pronounced /ˈnʌtˌhæt͡ʃ/.nounAny of various small passerine birds from the genus Sitta, found throughout the northern hemisphere and noted for their unusual proclivity for climbing down trees head first.“Nuthatches have rather a habit of entering houses through open windows, probably out of curiosity; and we owed to this habit a pet nuthatch, which became extremely tame, and used to take flies from our finger.”