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Abstract
MUCH work has been done on delayed implantation in macropod marsupials and it is now known that the phenomenon is widespread through the family1–7. Sharman has shown that the average length of pregnancy in the red kangaroo (Megaleia rufa) is 33.17 days and that post-partum oestrus occurs about 2 days after parturition arid the entry of the neonatus into the pouch. Although copulation will now occur, the new foetus—the species is monovular—will remain in one of the two uteri in the blastocyst stage for as long as the pouch young is suckled. If the neonatus is removed from the pouch, lactation is arrested, the quiescent blastocyst starts to develop, and the next generation is born after about 31 days. Usually, the “joey” or pouch young remains in the marsupium for about 236 days and it is not unusual in some macropod species for a young-at-foot to be fed from one nipple, a naked neonatus from another while a third generation, in the form of a blastocyst, lies dormant yet viable in one of the uteri. This species inhabits arid and semi-arid country over a vast area of Australia.
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