Inferring cost of transport from whole-body kinematics in three sympatric turtle species with different locomotor habits.Chelonians are mechanically unusual vertebrates as an exoskeleton limits their body wall mobility. 
Inferring cost of transport from whole-body kinematics in three sympatric turtle species with different locomotor habits
Our results show that Apolone travels faster than the other two species, and that Chelydra has higher levels of yaw. 
Apolone
Our results show that Apolone travels faster than the other two species, and that Chelydra has higher levels of yaw. 
Chelydra
All the species show poor mean levels of energy recovery, and, whilst there is considerable variation, never show the high levels of energy recovery seen in cursorial quadrupeds. 
cursorial quadrupeds