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"Speotyto. Burrowing Owls. tarsi long, about twice as long as the middle toe without its claw, very scant-feathered in front, bare behind; toes bristly. The long slim legs are quite peculiar.

The Beaks and Claws of a Burrowing Owl

"Speotyto. Burrowing Owls. tarsi long, about twice as long as the middle toe without its claw, very…

Side view of the Barn Swallow's claw. "Hirundo horreorum. Barn Swallow. Tarsi shorter than middle toe and claw, above feathered for a little distance; basal joint of middle toe partly adherent to both lateral toes." Elliot Coues, 1884

Barn Swallow Claw

Side view of the Barn Swallow's claw. "Hirundo horreorum. Barn Swallow. Tarsi shorter than middle toe…

The tarsi and their ligaments.

Eyelid

The tarsi and their ligaments.

"Cupidonia. Tarsi scant-feathered to the toes in front and on sides, bare on a strip behind; toes extensively webbed at base." Elliot Coues, 1884

The Foot of a Prairie Hen

"Cupidonia. Tarsi scant-feathered to the toes in front and on sides, bare on a strip behind; toes extensively…