To avoid being caught by surprise, you'd best keep your ears open. That means listening for any cries of warning from your fellows—and eavesdropping on the other species around you. It turns out that impalas, wildebeests, and zebras can recognize each other's calls. What's more, they don't pay the same amount of attention to each alarm cry, scientists reported February 19 in the journal Animal Behaviour. When the researchers broadcast zebra calls, all three species went on the alert. But when zebras heard impala or wildebeest calls, they were less perturbed. This could be because impalas are smaller and targeted by more predators, making their calls less concerning for the other, larger, herbivores.