(1):

(n.) A European bird (Nucifraga caryocatactes), allied to the magpie and crow. Its color is dark brown, spotted with white. It feeds on nuts, seeds, and insects.

(2):

(n.) The American, or Clarke's, nutcracker (Picicorvus Columbianus) of Western North America.

(3):

(n.) An instrument for cracking nuts.