A study in the Biological Journal of the Linnean Society showed that female kangaroos like a little muscle on their romantic partners. No, the word kangaroo didn't come from a mistranslation. A group of kangaroos is a mob or troop, and a group of tree kangaroos are called a colony. Kangaroo meat was a source of food for Aboriginal people. Although they're definitely the symbol of the nation, kangaroos aren't only found on the Australian mainland.