The reason Hippos are the most dangerous and most feared is because hippos kill more people in Africa then all the carnivores combined. Hippos are very territorial and will flip your boat and drown you in the water, stomp the crap out of you, or just bite down on you.
Noun. 1. jeopardy-a source of danger; a possibility of incurring loss or misfortune; drinking alcohol is a health hazard. endangerment, hazard, peril, risk. danger-a cause of pain or injury or loss; he feared the dangers of traveling by air. health hazard-hazard to the health of those exposed to it.
If you don't know what Jeopardy! is, I can't imagine where you've been living for the past few decades. A TV game show, Jeopardy! puts a bunch of categories on a game board and lists monetary values beneath them. Players pick a category and a monetary value to play for, get the answer, and have to respond in the form of a question.