In which one of the following groups of animals, oestrus cycle is not observed?

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Monkeys. Most mammals go through an oestrus cycle, where the female is fertile only during a short "heat" period.Cows, rats and tigers are non-primate mammals, so all of them show this oestrus cycle pattern.Primates, including monkeys, apes and humans, do not show an oestrus cycle at all. Instead, they show a menstrual cycle, where the uterine lining sheds as bleeding if pregnancy does not occur.So monkeys are the odd one out here, making option (b) the answer.Read more: NCBI Bookshelf, Endotext, Menstrual Cycle Physiology

In which one of the following groups of animals, oestrus cycle is not observed?

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