Australopithecus boisei, also known as Paranthropus boisei, was an early hominid species that existed in East Africa around 2.3 to 1.4 million years ago. This species was known for its robust cranial and dental features, earning it the nickname "Nutcracker Man." Other synonyms for Australopithecus boisei include Australopithecus (Paranthropus) robustus, Zinjanthropus boisei, and Paraustralopithecus boisei. Despite its distinctive physical traits, the exact place of Australopithecus boisei in the human evolutionary tree is still debated among scientists. However, its discovery and study have significantly contributed to our understanding of our early human ancestors.