Some cynodonts may have been giving birth to live young much sooner in evolutionary history than previously assumed. A new Frontiers in Mammal Science study has offered the first compelling evidence that cynodonts may have been viviparous—a reproductive mode characterized by live birth.
Source: [Phys.org](https://phys.org/news/2026-08-million-year-fossil-story-mammalian.html)