Does a tuataras have 4 chambered hearts?

Tuataras do not have four-chambered hearts; instead, they possess a heart that is more similar to that of reptiles, which typically have three chambers. However, tuataras have a unique heart structure with a partially divided ventricle that allows for some separation of oxygenated and deoxygenated blood. This adaptation is thought to improve their efficiency in oxygen use, particularly in their cool, high-altitude habitats. Overall, tuataras exhibit a blend of reptilian and more advanced heart features, but they do not possess a fully four-chambered heart like birds or mammals.