Paleolithic religions are a set of spiritual beliefs thought to have appeared during the Paleolithic time period. Paleoanthropologists Andre Leroi-Gourhan and Annette Michelson believe religious behaviour emerged by the Upper Paleolithic, before 30,000 years ago at the latest, but behavioral patterns such as burial rites that one might characterize as religious — or as ancestral to religious behaviour — reach back into the Middle Paleolithic, as early as 300,000 years ago, coinciding with the first appearance of Homo neanderthalensis and possibly Homo naledi.