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The South American tropics are dominated by the mostly terrestrial teiioids and mostly scansorial and arboreal iguanians.

Feet scansorial, versatile; the outer toe long, and connected by the first joints to the inner toe.

As implied above the brush mouse is adapted for a scansorial mode of life; but other mice and rats inhabit the rocky crevices of low bluffs.

They belong to the scansorial order of birds; that is, they have two toes forward and two backward.

Among the smaller birds in these forests, the trogons—a genus of scansorial birds—are the most beautiful, surpassing their relatives found in other parts of the world.