Why should you never give a Kangaroo a carrot?

Why are Kangaroos such good jumpers? What do you call a group of Kangaroos? Is it true, Kangaroos can't move backwards? For free home activities sign-up at www.WhoSmarted.com See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.