Cochleosaurus and Egoyrinus - Late Carboniferious
After insects had dominated the land for many millions of years fish slowly began to spend more and more time in shallow waters and even on the land. They developed lungs, many early forms having both gills and lungs, like the lungfish that can still be found today. Their fins developed into legs until about 370 million years ago, at the end of the period known as the Devonian the first amphibians evolved.
310 million years ago, in what will eventually become Scotland a pair of Cochleosaurus, 1.5 metre long amphibians, look for a suitable nesting site near to the waters of a swamp. However lurking in the dark waters the top predator of the time Egoyrius, a 4.5 metre long carnivore watches their activities with hungry interest.