>>Normally, animals reproduce by either laying eggs or giving birth to live young, but an Australian species of lizard can apparently do both in the same pregnancy. Scientists at the University of Sydney witnessed a three-toed skink lay three eggs before going on to later give birth to a live baby, an event that had never been observed in any vertebrate species before.<<
>>The team says the discovery makes the three-toed skink a good model for studying the evolution of pregnancy in animals. In evolutionary terms, egg-laying is the older method of reproduction, with many species later developing the ability to carry young to term internally. But as we see around us, laying eggs hasn’t gone away either – both methods have their pros and cons. <<
https://newatlas.com/lizard-lays-eggs-live-birth/59134/