Discover why the Killer Whales' movements makes them so difficult to study in the wild.Nature's Children series provides young readers (Ages 8-10) with fascinating information about the planet's most incredible wildlife species. Each title offers a complete picture of the animal- from birth to adulthood- and describes its place in our world, including how humans impact it and its environment. Did you know that orcas live in family groups their entire lives-and that their intelligent, collaborative hunting techniques are what earned them the nickname 'killer whales?'