A large body of stories of the previous births (jatis) of the Buddha as a bodhisattva, in human and animal form, part of the Khuddaka Nikaya within the Sutta Pitaka of the Buddhist canon.
The Jataka-bodhisattva (past lives of the Buddha) link, their place in the Sutta Pitaka, and their depiction in the art of Bharhut, Sanchi and Ajanta are standard culture and source facts.
Jatakas are stories of the Buddha's earlier births (not his single final life), and they form part of the Sutta Pitaka, not a separate scripture; they double as a literary source and as the subject of stupa and cave art.
Tales of the Buddha's past lives (bodhisattva), in the Sutta Pitaka, depicted at Bharhut, Sanchi and Ajanta.