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In Latin, ‘scansorius’ means capable of climbing and ‘arboreus’ means ‘of a tree’. Modification of organisms for leading life on the walls, rocks, branches of the trees or arbo­real habitat, are called scansorial adaptation.

For safety, retreat, abundant supply and easy procurement of food relatively feeble crea­tures have taken refuge on trees and have undergone scansorial adaptation. It is believed that flying vertebrates except fishes were derived from scansorial types.

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