An international research team led by scientists in Canada has uncovered a likely explanation for one of the more unusual features of snake development: why embryos curl into tight spirals before hatching. This coiling behavior appears to help snakes accommodate the exceptionally long bodies that distinguish them from every other vertebrate.
The findings, published in Current Biology, suggest that the spiral forms as the embryo's body rapidly lengthens while its gut acts as a tether. That physical constraint causes the growing body to buckle and twist into a right-handed coil.
"It's like when you adjust the length of a strap and the longer, buckling side of the loop twists," explains senior author and team leader Dr. Tetsuto Miyashita, evolutionary biologist at the Canadian Museum of Nature.
Why Spirals Form in Nature
The discovery adds snake embryos to a long list of naturally occurring spiral structures that scientists are still working to understand.
