The cheetah (Acinonyx jubatus) is the only member of the genus Acinonyx that once had 4 other species, now extinct. Its teeth are small compared to other big cats. The cheetah compensates for its weak jaw from the aerodynamic shape of its body and from its well-developped respiratory system. Its big heart, its deep chest, its large lungs and nostrils provide an optimal breathing. On this basis, the cheetah breathes in rhythm with its pace.