Parasites are a nasty part of a healthy ecosystem, thriving off the nutrients of their hosts while their host is hurt in exchange. While they aren't beneficial to the host, understanding where parasites come from and how they infect the body is important for young readers. Through the vivid photographs complemented by comments from illustrated teaching companions, young readers get an introduction to not just where these nasty creatures come from, but how readers can avoid infection. Young scientists will read along with the fun illustrated characters who encourage a better understanding of what a parasite is.