Acknowledgments
This work was supported by a Nelson Mandela University Research Themes Grant (BS), and an NRF Thuthuka Grant (no. 106958) to (BS). Funding was also provided by BirdLife South Africa (KNO), and the Tygerberg Bird Club (KNO). A special thanks to the following locations for granting access for sample collection: Blue Hill Nature Reserve (Lee family), Driehoek (Du Toit family), Sanddrif (Nieuwoudt family), Kleinrivier Wilderness, Drie Kuilen Nature Reserve, Tenahead Lodge, Tiffendell Ski Resort, and many Cape Nature reserves (Kogelberg, Kammanassie, Cederberg, Anysberg, and Swartberg). Data collection was accomplished with help from Campbell Fleming, Cameryn Brock, Nick Pattinson, Sophie Monsarrat, Alex Thouzeau, Shelby Bohn, Lauren Bailey, and Maxine Smit. Last but certainly not least, thanks to Dr Ângela Ribeiro for her comments on an early draft which were exceedingly beneficial to our manuscript.