(1) Like scaphopods, bivalves have a retractile foot which they use to burrow.(2) In Australia, for example, marsupial herbivores the size of a rhinoceros, kangaroos nearly 10 feet tall, and carnivorous lion-like forms with shearing teeth and retractile claws all roamed the landscape.(3) The habit of felids to use primarily their forelimbs to capture prey is supported by the anatomy and function of their retractile claws.(4) The feeding zooids use retractile tentacles, called the lophophore, to filter feed and have a U-shaped gut for digestion.(5) The morphology of the middle and distal phalanx in Tapocyon exhibits a retractile claw condition, supporting this as the primitive condition for Carnivora / Carnivoramorpha.(6) Telephone cords used to connect a handset to a base should have sufficient retractility to insure that they will return in a controlled gradual manner to their normal retracted position after having been extended and released.(7) The pull cord mechanism for the self-opening umbrella constitutes at least a core tube rest, a core tube, a plurality of sheaves, a lower shaft, a center shaft and a string of pull cord, in which the center shaft contains several sections of short shaft for retractility .