Greater kudu average length of , with the record being . They diverge slightly as they slant back from the head. The horns do not begin to grow until the bull is between the age of 6–12 months, twisting once at around 2 years of age, and not reaching the full two and a half twists until they are 6 years old; occasionally they may even have 3 full turns. This is one of the largest species of antelope. Bulls weigh , with a maximum of , and stand up to tall at the shoulder. The ears of the greater kudu are
Lesser kudu just the lesser kudu by American zoologist Edmund Heller, the type species being "A. strepsiceros". However, the lesser kudu is now placed in "Tragelaphus". In 2005, Sandi Willows-Munro (of the University of KwaZulu-Natal) and colleagues carried out a mitochondrial analysis of the nine "Tragelaphus" species. mtDNA and nDNA data were compared. The results showed that the tribe Tragelaphini is monophyletic with the lesser kudu basal in the phylogeny, followed by the nyala ("T. angasii"). On the basis of mitochondrial data, the lesser kudu separated from its sister clade around 13.7 million years ago. However, the nuclear data show that lesser