Parasites are animals, insects, viruses, and microscopic beings that latch onto, trap, trick, and live off of other living things. This series provides a colorful overview of what these yucky creatures are, how they work, what and why they do what they do. A chigger is too small to see as it attacks. But this familiar parasite creates a big itch when it feasts on its host’s skin cells. Accelerated Reader: Reading Level 5.8, 0.5 Points.