<human>: Which are the most interesting facts about the hippopotamus?
<bot>: 
1. The hippopotamus is one of the largest living species of land mammal, with adults typically weighing between 1,500 and 4,000 pounds (680–1,800 kg).
2. Hippos are also known for their loud grunts and snorts which can be heard from up to half a mile away.
3. Female hippos give birth to a single calf every two to three years.
4. Hippos have poor eyesight but excellent hearing, allowing them to detect predators from far away.