This Animal Can Pause Its Pregnancy For A Record Period
By: EjazUlHaqBhat
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The tammar wallaby holds the record for the longest pregnancy pause, with the ability to put its embryos on hold for up to 11 months
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The main advantage of pausing pregnancy is that it separates mating and birth
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Tammar wallabies have thick, dark grey-brown fur, with reddish-brown on their limbs and sides
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They live in scrub habitats, and dense coastal heath in Western and Southern Australia
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The tammar wallaby pauses the development of a backup embryo to allow its older sibling to grow
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Changes in day length during the Australian summer trigger the restarting of the embryo's development
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It adopts two methods (suckling in the first half of the year, short days in the second) to pause for almost a year and give birth in January
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This ensures the young leave the pouch the following spring instead in the middle of a hot Australian summer
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ndtv.com