Answer: nuthatch

AnswerCrossword Clue
NUTHATCHBird often on tree trunks upside-down
NUTHATCHSharp-beaked bird
NUTHATCHShort-tailed bird.
NUTHATCHTitmouse's relative
NUTHATCHTree-climbing bird
nuthatcha small bird
nuthatchA small songbird with a long strong bill, a stiffened square-cut tail, and the habit of climbing down tree trunks head first