Hippopotami may look cute and cuddly, but don’t judge a book by its cover. Hippos are incredibly aggressive animals that, despite their short, chubby legs, can outrun a human. They will often attack other animals, like crocodiles, for apparently no reason. Hippos are semi-aquatic and primarily live off of plants. Hippos are common targets for poaching, which has made them a “vulnerable species.” They can be found in much of Southern Africa, with the densest populations living in Zambia and Tanzania.