When it comes to animal biology, one common curiosity is whether female birds have periods like humans. After all, menstruation is a natural part of the reproductive cycle in women. But do birds experience the same?
The Short Answer: No, birds don’t have periods.
In fact, very few animals menstruate. Only:
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Great apes (including humans),
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Elephant shrews, and
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Some species of bats
actually undergo true menstruation, where the uterine lining is shed and expelled as blood.
What About Other Animals?
Some mammals may show slight bleeding during estrus (heat cycle), but this is not menstruation. It’s simply related to hormonal changes in their reproductive cycle.
And Birds?
Birds have a completely different system.
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Female birds do not have a uterus like humans. Instead, they have an oviduct where eggs develop.
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Instead of shedding a uterine lining, birds form and lay eggs as part of their reproductive process.
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That means no menstrual cycle, no period bleeding.
Why This Matters
It’s a reminder that while reproduction is universal in living beings, the mechanisms differ widely across species. Menstruation is actually the exception, not the rule, in the animal kingdom.
✅ Takeaway: Birds don’t menstruate, and female birds never have period bleeding. Their reproductive system is based on egg-laying, not shedding of a uterine lining.
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