Hippos are familiar animals, and we can often see them in videos or pictures in the water.In fact, compared with the time spent on land, hippos spend more time in the water, and many of their activities can be carried out in the water.For example, when they give birth to young hippos and feed them, they do it in the water, and they may sleep in the water.Hippos, as mammals, need lungs to breathe, and when they sleep, they also need to breathe, so many people will find it strange how hippos sleep when they sleep in the water.
The above has been introduced, the hippo can sleep in the water.But how do they solve the problem of breathing while they sleep? A hippopotamus breathes with its lungs and cannot breathe in water.When a hippo is awake, it has to breathe every three to five minutes.When they sleep, they are no exception.The reason they can sleep in the water is that they sleep with their heads or nostrils out of the water, so they can breathe smoothly.
In addition, sometimes hippos will gather together in groups when they are sleeping.While sleeping, one hippo will put its head on the other hippo's very large back, so that its head can come out of the water.If there were a group of hippos, they would rely on each other and they would all be able to breathe.Although hippos sometimes sleep on land, they sleep more in the water.
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