Stick insects are arthropods of the order Phasmida that resemble sticks or leaves. They are 7 to 10 centimeters long, wingless, and range in color from brown to green. Females lay hundreds of eggs without needing fertilization by males. Stick insects use their segmented legs and antennae to move nocturnally while remaining motionless during the day among vegetation where they feed herbivorously on plants like roses in warm regions.