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They lay eggs, they do not have live birth.

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Menstruation is a characteristic of placental mammals. It is a process where by the uterus gives off its unused inner layer because the egg was never fertilized. Birds and reptiles do not have a uterus. They lay a hard shelled egg called the amniotic egg. Most reptiles leave their eggs alone to develop on their own. Once hatched the reptile hatching must fend for themselves for the most part.


Birds on the other hand sit and protect the nest, caring for and controlling the temperature of the eggs. Birds are very attentive parents.

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