ocr: a Climbing Quit Branches à - - a à * - - Es - 71 - - - d 4 Woodpecker Fishhawk Heron Birds ha ve a backward-tacing toe (two in woodpeckers and owls) so can graspthel branches they perch on, There is a locking device which ensures that a perched bird's grip remains firm, without any need for the muscles to be constantly active. The muscles in the lower leg, that tighten the grip, have tendons running to the tips of the toes. The part of each tendon that runs a. long the undi erside of the toes has a rough surface and is enclosed by a sheath W. hich has a ridged inner surfac ce. When the bird is ...
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