Thomson's gazelles are 55 to 82 cm tall, body length of 80 to 120 cm , and weigh 15 to 25 kg(females), 20 to 35 kg (males).They have light brown coats with white underparts and distinctive black stripes on the sides. Their horns are long and pointed with slight curvature. The white patch on their rumps extends to underneath the tail, but no further. Grant's gazelles are sometimes mistaken for Thomson's gazelles. Although some Grant's do have the black stripe running across their sides, the white on their rumps always extends above the tail.