The large and diverse insect family Miridae contains the plant bugs, leaf bugs, and grass bugs, and may also be known as capsid bugs. It is the largest family of true bugs belonging to the suborder Heteroptera, with over 10,000 known species and new ones constantly being described. They are small, terrestrial insects, usually oval-shaped or elongate and measuring less than 12 millimetres (0.5 in) in length. Some are brightly coloured, others drab or dark. Some genera are ant mimics at certain stages of life. Most of the more well-known mirids have received attention because they are agricultural pests. They pierce plant tissues and feed on the juices.