Health Bar is a feature in mope.io. Higher tier animals have a bigger health bar than lower tier animals. It takes 3 bites to kill a Mouse, Chipmunk, but 5 to kill a Hippo, Orca, Mammoth. The way to lose health is if other players touch you. You can also lose health when you get tail bitten. If your health runs out a message pop up saying: oh no! You were eaten! Watch out for red-circled players or watch your dead! watch out for your health!