I should find it, there’s a video about a japanese researcher who identified that certain calls mean “threat”, or “threat: snake” and they follow grammar rules, meaning “snake threat” doesn’t provoke any kind of scattering behavior. These calls are also understood cross-species to some extent. Birds that speak different “dialects” can still understand each other.
Also, their calls are a language.
I should find it, there’s a video about a japanese researcher who identified that certain calls mean “threat”, or “threat: snake” and they follow grammar rules, meaning “snake threat” doesn’t provoke any kind of scattering behavior. These calls are also understood cross-species to some extent. Birds that speak different “dialects” can still understand each other.
[edit] Here’s one. And here’s the second.