I recently took my daughters to the local aquarium and one of our favorite attractions are the hippos. They are so adorable and so enormous. Interesting fact: Hippos are so big and heavy (up to 3.5 tons) that they are able to walk underwater at the bottoms of lakes and rivers. They can also only have one offspring. But be forewarned! Although hippos look so cute and approachable, they are actually extremely dangerous. So if you ever find yourself in the rivers of Sub-Saharan Africa, DO NOT approach these animals! But if you find you and a hippo between five inches of glass, enjoy these wonderful animals!