Looking after a bunch of boisterous youngsters was taking its toll on Grandpa Kangaroo. All he could think of was finding some time to himsel f but that meant being alone. Kangaroos live in groups called mob s. Usually a large male kangaroo oversees a number of females and their young. While some kangaroos in the mob have their heads down grazing, ot hers keep watch for danger. A kangaroo alone could easily fall prey to d ingoes or other predators. About the Author: Rebecca Johnson is an award-winning primary school science teacher and has written more than 60 books for children.