Spiral morphogenesis from growth mismatch

Snake embryos coil into a usually clockwise spiral because the developing spine elongates faster than the gut can expand, creating a mechanical twist that packs a long vertebral column into a small egg. The study analyzed over 900 embryo images and links a specific growth‑rate mismatch to a reproducible morphological outcome. — Understanding a simple mechanical rule that produces spiral body plans has broader implications for morphogenesis research, biomimicry, and how we think about emergence in biology.