Thomson’s gazelles are 60–90 cm (24-35 in) tall and weigh 13–22 kg (29-40 lb). They have light brown coats with white underparts and a distinctive black stripe. Their horns are long and pointed with slight curvature. The white patch on their rump extends to underneath the tail but no further. An error sometimes made is the misidentification of Grant’s gazelles as Thomson’s Gazelles. Although some Grant’s do have the black stripe running across their sides, the white on their rump always extends above the tail. A noticeable behaviour of Thomson’s gazelles is their bounding leap, known as stotting or pronking, used to startle predators and display strength. They often congregate with other hoofed mammals, or ungulates, such as wildebeest and zebra and usually live and migrate in herds with hundreds or thousands of other Thomson’s gazelles.