Note Book VII. Chap. 1. Note (l) — BOOK VII.

[l] Such Birds as climb, particularly those of the Wood-pecker Kind, have for this Purpose (as Mr. Willughby observes, L. 2. c. 4.) 1. Strong and musculous Thighs. 2. Short Legs and very strong. 3. Toes standing two forwards and two backwards. Their Toes also are close joined together, that they may more strongly and firmly lay hold on the Tree they climb upon. 4. All of them——have a hard stiff Tail bending also downwards, on which they lean, and so bear up themselves in climbing.