Abstract Flat hydrodynamic shells likely represent an evolutionary trade-off between adaptation to an aquatic lifestyle and the instability of more rounded shells. thought beneficial for self-righting. Trade-offs often result in compromises. this is particularly true when freshwater turtles. https://www.countryscenesaddleryandpetsuppliers.shop/product-category/hair-on-cowhide-headstall-and-breast-collar-sets/