Stick insect species, often called walking sticks, range in size from the tiny, half-inch-long (11.6-millimeter-long) Timema cristinae of North America, to the formidable 13-inch-long (328-millimeter-long) Phobaeticus kirbyi of Borneo. This giant measures over 21 inches (55 centimeters) with its legs outstretched, making it one of the world’s longest insects. Females are normally larger than males. ~ National Geographic