Have you ever seen a flea up close? Readers will be able to say they have after viewing a variety of freaky flea photographs as they learn about the lives of these creepy creatures. Readers may be familiar with the fleas that crawl on pets, but they also learn that one kind of flea spread the plague that killed more than a quarter of the European population during the Middle Ages. As they read, they learn many other things that apply to science curriculum topics, including life cycles and parasitic relationships.