Black rhinoceros
The scientists had the idea for this experiment because the Swahili language word for oxpecker is "Askari wa kifaru," which means "the rhino's guard" in English.  One of the scientists said it was important to listen to indigenous peoples when studying things in the places where those people live. "We too often dismiss the importance of indigenous people and their observations," said ecologist Roan Plotz, who worked on this study. "While western science has been incredibly useful, there are many insights we can learn from indigenous communities."