pig-nosed turtle - carettochelys insculpta

zoo wildlife underwater turtle reptile reef organism mammal fish bird art aquarium animal amphibian aquatic swimming nature shell softshell water green dark marine creature stream river pond habitat diving floating fins scales wetland freshwater graceful motion gliding submerged species native streamlined biology herpetology conservation natural wild amphibious paddle prehistoricadaptation fluidity evolution buoyancy grace carettochelys insculpta swimming Trionychia nature