'Ichthyosaurs swam by undulating; plesiosaurs, mainly by moving these'
fins
SWIMMERS: Ichthyosaurs swam by undulating; plesiosaurs, mainly by moving these
Ichthyosaurs swam by undulating; plesiosaurs, mainly by moving these
Ichthyosaurs swam by undulating; plesiosaurs, mainly by moving these
SWIMMERS
fins
SWIMMERS