They had a teardrop-shaped body and two sets of powerful paddles to help them swim through the water.As the top predators in the sea at the time, they would have preyed on squid-like animals, fish and other marine reptiles.One of the largest pliosaurs known is the Australian Kronosaurus that grew up to 12m.Dr Milner adds, 'Pliosaurs were reptiles and they were almost certainly not warm-blooded so