The common hippopotamus, or river horse, spends much of its life submerged in water to keep its massive body cool under the blazing sun. Hippos are highly territorial in water but surprisingly agile on land, despite their bulk. Feeding primarily at night, they consume vast amounts of grass. Although they seem docile, hippos are among Africa's most dangerous animals due to their unpredictable nature. Conservationists work tirelessly to protect hippos from habitat loss and conflicts with humans.