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"Fig. 47. - Raptorial foot of an owl, The raptorial is another modification of the insessorial foot. It is advantageous to a bird of pray to be able to spread the toes as widely as possible, that the talons may seize pray like a set of grappling irons; and accordingly the toes are widely divergent from each other, the outer one in the owls and a few hawks being quite versatile. In a raptorial character, the toes are cleft profoundly, or, if united at base, it is by movable webbing; the claws are immensely developed and the under-surfaces of the toes are scabrous or bulbous for greater security of the object grasped." Elliot Coues, 1884

The Raptorial Foot of an Owl

"Fig. 47. - Raptorial foot of an owl, The raptorial is another modification of the insessorial foot.…