If you’ve ever listened in on a neighbor’s conversation and considered it a uniquely human trait, you might be in for a surprise. Sure, we’ve perfected the art of eavesdropping from even a great distance — if tapped phone lines or cyberattacks are any indication — but we aren’t the only animals that keep a wary ear out.
Researchers have long been curious about the ways that critters communicate with others of their own species. But they’ve increasingly focused on the complex communication that occurs between species as well.
