No bird is better adapted for climbing up a tree trunk than a woodpecker. The foot of this Pileated Woodpecker is ideal for clinging, and its relatively short legs allow it to anchor itself securely. When traveling upward, the woodpecker’s a master. But hitching down? Not so much — usually they will fly. Nuthatches, however, can easily go up and down. This White-breasted Nuthatch walks over the bark of trees by grasping with one leg while using the other for a prop. It also has a rear-facing toe equipped with a long, sharp claw that’s ideal for hanging on while heading downward.

More info and transcript at BirdNote.org. 

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