Laetoli ni eneo karibu na Bonde la Oltupai (Tanzania), km 45 kusini kwake, ambapo mwaka 1972 Mary Leakey aligundua nyayo za kale (miaka milioni 3.7 iliyopita) za zamadamu watatu waliotembea kwa miguu miwili. Mwaka 2015 ushirikiano wa watafiti wa Tanzania na wa Italia uliwezesha kugundua nyayo nyingine mbili za msafara huohuo, za mmojawapo zikiwa ndefu sana kuliko nyingine. Mtu wa kwanza alitoka wapi Mary D. Leakey and J. M. Harris (eds), Laetoli: a Pliocene site in Northern Tanzania (Oxford, Clarendon Press 1987). ISBN 0-19-854441-3. Richard L. Hay and Mary D. Leakey, "Fossil footprints of Laetoli." Scientific American, February 1982, 50-57. Archaeologyinfo.com (n.d.) Australopithecus afarensis. Retrieved from http://archaeologyinfo.com/australopithecus-afarensis/ Ditchfield, P. & Harrison, T. (2011). Sedimentology, Lithostratigraphy and Depositional History of the Laetoli Area. In T. Harrison (Ed.), Paleontology and Geology of Laetoli: Human Evolution in Context: Geology, Geochronology, Paleoecology and Paleoenvironment, Vertebrate Paelobiology and Paleoanthropology. 1, pp. 47–76, Dordrecht, Netherlands: Springer Leakey, M.D. (1981).