Its snout is dotted with small pits that will have been the location of glands to assist it detect adjustments in water stress made by potential prey. And on its head is a gap that will have housed a parietal, or third, eye. Lizards, frogs and a few fish alive at this time have one in all these. It’s light-sensitive and might need helped in finding different animals, particularly when the pliosaur was surfacing from deep, murky waters.
