Since the mating of certain European and African bees in Brazil during the late 1950s, an aggressive bee has been slowly heading northward. These Africanized honeybees are known as invasive species today as they disrupt the ecosystems they enter. More information about the "killer bee's" spread draws readers into the interesting scientific topic of invasive species. Fascinating fact boxes and terrifying maps of the bees' spread highlight how serious a threat invasive species are. With discussions about ecosystem balance, food chains, and conservation, the main content undoubtedly supplements the science curriculum.