Cape Sugarbird (IMAGE) University of Tennessee at Knoxville Caption Cape Sugarbird (Promerops afer) perched atop a Protea (also known as a sugarbush) along the coast of the Western Cape, South Africa. Both the sugarbird clade and Protea, their preferred source of nectar, are endemic to southern Africa. Credit Daniel Field. Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.