Two species of kudus exist within the genus Tragelaphus: the lesser kudu (Tragelaphus imberbis) and the greater kudu (Tragelaphus strepsiceros). Likewise, two species of elands exist within the genus Taurotragus: the common eland (Taurotragus oryx) and the giant eland (Taurotragus derbianus). The key differences between kudus and elands are habitat, size, appearance, reproduction, and behavior.