. . . . . . . . . "Ptilostomus afer" . . "Bovidae" . . "Paul Cools. 2012. Ptilostomus afer interaction->riding on Bovidae. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/1566877> 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." .