Hemiptera is a large order of insects, with some 67,500 known species in three suborders. Members of this order are called "true bugs". Members of the Hemiptera are distinguished from all other insects by both adults and nymphs having a proboscis that includes a salivary channel as well as a food channel. The proboscis is usually specialized to suck the juices from various parts of plants, including seeds, although some species are predatory, and a few are adapted to suck blood from mammals.