Pleurodira is a suborder of turtles known for their unique neck movement. Unlike other turtles, they cannot retract their heads into their shells. Instead, they bend their necks sideways to tuck their heads under the edge of their shells for protection. This group primarily includes freshwater turtles found in South America and Australia. Pleurodira species are adapted to various aquatic environments, often inhabiting rivers, lakes, and swamps. They play important roles in their ecosystems, contributing to nutrient cycling and serving as prey for larger animals.