In large fish tanks we see some turtles. Unlike tortoises and tortoises, these turtles can live directly in deep water without drowning without surfacing. Their lung capacity is much better than those of semi-water turtles and tortoises. The main thing is that they can live in an environment full of water. Semi-water turtles need to be reared in shallow water, and they also need to provide a sunbathing platform for their sunbathing. Tortoises can only live on land, and they are expensive and difficult to raise. And some large fish tanks ca n’t support those semi-water turtles and tortoises, and they will raise some full-water turtles. They do n’t need a tanned back and tanned platform, and they do n’t need low water temperature to raise them. The biggest feature of all water turtles is that their fins are more developed, which is evolved from their long-term survival in water.