Hitchhiking oxpeckers warn endangered rhinos when people are nearby
Red-billed oxpeckers hitching rides on the backs of black rhinos are a common sight in the African bush. The birds are best known for feeding from lesions full of ticks or other parasites on a rhino’s hide. But new research suggests that the relationship between the two species is much more mutualistic (SN: 10/9/02). Shouty and shrill oxpeckers can serve as an alarm bell, alerting black rhinos to the presence of people, scientists report April 9 in Current Biology. That could help the endangered animals evade poachers, the researchers propose. “Rhinos are as blind as bats,” explains Roan Plotz, a behavioral ecologist at Victoria University in Melbourne, Australia. Even in close proximity, a rhino might struggle to notice lurking danger by sight. But the oxpecker easily can, unleashing a sharp call to warn of intruders. In South Africa’s Hluhluwe–iMfolozi Park, Plotz and his colleague Wayne Linklater of California State University, Sacramento approached 11 black rhinos (Diceros bicornis) by foot on the open plain on...