Other fossils (leaves and many mammals) found in the Lukeino Formation show that Orrorin lived in a dry evergreen forest environment, not the savanna assumed by many theories of human evolution.
Outros fósiles (follas e moitos mamíferos) atopados na Formación Lukeino mostran que Orrorin viviu nun ambiente de bosque perenne seco, e non nunha sabana como se asume nas teorías sobre a evolución humana.