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Plot of the first two axes of a principal components analysis of swimming kinematics for eight variables in four species of turtle: Carettochelys insculpta (red squares), rowing Apalone ferox (blue inverted triangles), rowing Trachemys scripta (green triangles) and flapping Caretta caretta (black circles). The first two axes explain 56.9% of the total variation in forelimb swimming kinematics. See Table 2 for axis loadings.
