. . . . . . . . . "Ptilostomus afer" . . "Phacochoerus africanus" . . "markus lilje. 2015. Ptilostomus afer interaction->riding on Phacochoerus africanus. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/6940522> on 05 Apr 2018." . . . . "http://iNaturalist.org is a place where you can record what you see in nature, meet other nature lovers, and learn about the natural world." .