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What animals have periods?

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Apart from humans and our close relatives, the only animals that menstruate are elephant shrews and certain bats. Why did it only evolve in these species? read more

"This is understandable because the menstruating bats are much smaller animals and have smaller blood vessels vascularizing their uterine lining," says Rasweiler. It seems the list of animals that menstruate is quite short: humans, apes, monkeys, bats and elephant shrews. read more

Most animals have specific periods of time during which the female will allow the male to mount and engage in sexual activity -- this is known as the estrus cycle. Some animals cycle every month until they become pregnant, some only cycle during specific parts of the year, some only cycle when there's a certain amount of daylight per day. read more

Humans and chimpanzees are the only animals that have "periods" or menstrual cycles. Other animals of the animal kingdom undergo Estrus, or heat periods (spikes in Estrogen output) during their Estrous cycle. read more

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