Question

Why do cats and dogs have oestral cycle but human beings have menstrual cycle though all are mammals?

Answer 1

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Female mammals of reproductive age have a period-like cycle, points out BBC Discover Wildlife, but they "reabsorb the old womb-lining rather than bleed it out." This reproductive process, called estrus but more commonly referred to as being in "heat," is what a cat undergoes in a monthly cycle when she isn't spayed.

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Answer 2

Answer:-

Female mammals of reproductive age have a period-like cycle, points out BBC Discover Wildlife, but they "reabsorb the old womb-lining rather than bleed it out." This reproductive process, called estrus but more commonly referred to as being in "heat," is what a cat undergoes in a monthly cycle when she isn't spayed.