The hippopotamus is a semi-aquatic animal, which can carry out various activities in the water and stay in the water for a long time.Hippos sometimes sleep in the water.When they sleep, they also need to breathe, and they can't breathe in the water, because they breathe with lungs as mammals.Therefore, when they sleep in the water, they will put their heads out of the water or their nostrils out of the water, so that they can breathe in the water.Hippos usually sleep in shallow water, so it is relatively simple to stick their heads out of the water.
Sometimes hippos gather together while sleeping, and one hippo will put its head on the back of another hippo while sleeping.Every hippopotamus does this. They lean on each other so they can all breathe.Therefore, their sleeping posture is more interesting at this time.
As mentioned above, hippos usually breathe in the water, and sometimes put their heads on the backs of their companions so that they can breathe.Individual hippos also sleep in the water, usually in shallow water, with their heads above the water.In addition to being in the water, sometimes hippos can sleep on the shore.They may sleep while basking in the sun, but this is only an occasional activity.In addition, hippos can sleep on mudflats, but this is not particularly common, hippos usually sleep in the water.
。