Discover why these spectacular creatures are at risk due to pollution and illegal fishing. 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 porpoises are mammals that breathe air, just like us-or that they sleep with only one side of their brain at a time? Learn fascinating facts like these-and more-all in the pages of this book!.