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Repeated evolution: from egg laying to live-birth and then back to egg laying. Lizards re-evolved laying eggs multiple times
Stuff happens … over and over again … A family of lizards has achieved something very unexpected, evolving to give birth to live young, before going back to egg laying. Most remarkably, the zoologists who observed this think it is possible they rediscovered laying eggs multiple times. https://www.iflscience.com/plants-and-animals/lizards-reevolve-to-lay-eggs-after-having-already-evolved-to-give-birth-to-live-young-/
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Repeated evolution of placenta: at least 100 independent origins across the animal kingdom
First off, let me start with some quotes from mainstream-articles: The placenta is arguably the most important organ of the body, but paradoxically the most poorly understood The placenta: a mysterious organ Despite being critical to a baby’s survival, the placenta remains something of a medical mystery. Detailed understanding about how it carries out all […]