https://ground-hornbill.org.za/
https://www.birdlife.org.za/
https://sanccob.co.za/
https://www.earthsendangered.com/continent.asp?gr=b&view=c&ID=1
https://speciesstatus.sanbi.org/assessment/last-assessment/2962/
https://ebird.org/home
https://animaldiversity.org/
https://animals.sandiegozoo.org/