The true bugs have a rostrum which can be pointed in many directions, allowing them greater range of food sources. This is unfortunate for humans since many Heteropterans have chosen to feed exclusively on the vital fluids of animals, including Homo sapiens. In fact, bedbugs (Cimicidae) have taken human blood as their preferred source of food. Many other Hemipterans feed on plant juices, with some species becoming pests to agriculturists.