SHARMAN 1 has established that normal gestation time for the Rottnest Island quokka (Setonix brachyurus) is twenty-seven days. He has further shown that, in delayed birth in this species ...

THE quokka (Setonix brachyurus) is a small marsupial about the size of a fox terrier which inhabits Rottnest, an island lying in the Perth Basin ten miles from the coast of Western Australia.