Australopithecus sediba was discovered in August 2008 by Matthew Berger and Lee Berger in South Africa's Malapa cave system. The site preserved the remains in calcified sediments that helped prevent weathering, offering researchers a unique look into early hominin anatomy and their environment (Dirks et al., 2010). 

Two partial skeletons, a juvenile boy (MH1) and an adult female (MH2), were discovered at the Malapa site. The preservation of these fossils allowed for special insights into not just their morphology, but also their mobility and diet (Berger et al., 2010). The detailed skeletal remains reveal important features such as the shape of the pelvis, hands, and cranial vault, implying a mix of primitive and derived traits. Additional remains, including vertebrae and limb bones, were eventually discovered expanding the number of bones and offering a broader overview of this species (Williams et al., 2013).

High precision uranium-lead dating and paleomagnetic evidence place Australopithecus sediba fossils between 1.97 and 1.98 million years old, putting them in the same time period as early Homo members (Pickering et al., 2011). This dating shows that Australopithecus sediba was potentially an earlier version of early Homo species, which could shed light on the evolutionary transition from Australopithecus to Homo. 

Australopithecus sediba lived in a mosaic landscape, consisting of open grasslands and dense woodlands. Evidence from the Malapa cave suggests the area was not a single consistent habitat, but rather a mixture of savanna, forests, and closed canopy woodlands. This variety of ecological niches may have influenced both the diet and the locomotion of Australopithecus sediba.

Australopithecus sediba contributes to the expanding amount of evidence indicating South Africa was an important player in early hominin evolution. While East Africa has long been the center of human research, the South African fossil record, particularly in locations like the Cradle of Humankind, has provided significant transitional fossils. 

The fossil remains of Australopithecus sediba are primarily based on the well-preserved partial skeletons of MH1 and MH2, discovered at the Malapa cave site in South Africa. The fossils were preserved in impressive detail because these two specimens were discovered in a single breccia deposit that dates to about 1.977 million years ago. This context most likely resulted from a sudden death and rapid burial event (Pickering et al., 2011). The combination of juvenile and adult material makes Australopithecus sediba one of the most informative early hominins ever found, providing a rare opportunity to study ontogeny, locomotion, and variation within the species.