Hippos are mammals that spend a long time in the water.During the day, hippos spend most of their time in the water, and even when they sleep, they may stay in the water.There is no doubt that hippos can stay in the water for a long time, which is one of the reasons why they get their name.They can't stay on land for very long because their skin will be dry and cracked.This seems strange to some people, because hippos, as mammals, breathe with lungs, and it is inconceivable that they can stay in the water for such a long time.
As mentioned above, the hippopotamus can stay in the water for a long time, but can't stay on the land for a short time.In fact, although hippos seem to be in the water all the time, they breathe above the water.Hippopotamus will really dive into the water all the time is relatively short, generally every three or five minutes to get a water breath, generally not more than half an hour.When they sleep, they may expose their heads or only their nostrils so that they can breathe smoothly.Hippos don't actually breathe in the water, because they breathe with their lungs.
Compared with the land, the environment in the water is actually more suitable for hippos.First, the water is cooler and more suitable for the skin of hippos.Second, the hippopotamus can use buoyancy to offset part of the gravity when it is in the water, so that the hippopotamus's limbs do not have to bear too much weight.In addition, when hippos encounter danger, they will instinctively take refuge in the water.
。
