🤰 NEW: Animals typically lay #eggs to reproduce, but live birth has evolved independently many times across diverse #vertebrate groups.
#Mammals made this reproductive transition once, while #squamates achieved it over 100 times. Scientists investigate the physiological hurdles, environmental pressures, and genetic adjustments required for #animals to retain embryos and give birth to live young.
👉 https://knowablemagazine.org/content/article/living-world/2026/why-did-pregnancy-evolve-in-animals
#pregnancy #evolution #biology #wildlife #science #reptiles #sharks #genetics #nature #education #research #zoology #lizards #snakes