https://phys.org/news/2018-07-eavesdropping-african-herbivores-alarm.html

Ecologist Dr. Kristine Meise, from the University's Institute of Integrative Biology, explains: "Animals often obtain information about the presence of predators from the alarm calls of other members of the same species. Although this idea is well documented and understood, little is known about how animals process other species' alarm calls.

"Eavesdropping on other species' alarm calls can provide them with crucial survival benefits as it increases the chances to detect and thus, to escape a predator. However, not all alarms are equally meaningful as species differ in their predator vulnerability. For example, cheetahs regularly attack gazelles, but not giraffes or buffaloes."