- A common hippopotamus calf cannot hold its breath longer than 40 seconds. After birth, the mother pushes it to the surface, otherwise it may drown.
- A hippopotamus calf can suckle underwater. It closes its nostrils and tightly presses its ears.
- The common hippopotamus can rapidly restore populations in the absence of threats, achieving annual growth of 10%. Its short gestation period is 8 months, and females give birth every two years.
年龄河马
在这里，我们介绍 河马 能活多久，以及预期寿命如何随年龄变化。
河马：它是怎样的