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
Rational animal in the Arbor Porphyriana, man is a substance, corporeal, living, sentient, and rational". In Meditation II of "Meditations on First Philosophy", Descartes arrives at his famous "I think, I exist" claim. He then goes on to wonder "What am I?" He considers and rejects the scholastic concept of the "rational animal": Shall I say 'a rational animal'? No; for then I should have to inquire what an animal is, what rationality is, and in this one question would lead me down the slope to other harder ones. Freud was as aware as any of the irrational forces at work in