All birds make different noises, think of it as kind of their 'speech'.
So can different species of birds understand other species?
I was always curious. I kind of always thought of it.. let's say... a budgie is english, and a lovebird is french. But they always SEEM to know what the other is thinking? Or is this all seen through body language and tone?
So what do you guys think?

Silly question, but I was just curious

I think it has a lot to do with body language. Like with people. Ever walk into a room and it is thick with tension? Or every walk into a room and feel instantly welcomed?

But I think vocalization plays it's own part. Soft noises usually mean happy/comfortable, harsher or louder noises mean danger/aggression.

I know from observing my own flock that when the Conures strike up their alert flock call, ALL the birds get on edge. The Tiels' crests all go up, and some of them will scatter to various places in their cage and Max will go thin as a stick and stand as tall as she can (which is actually quite funny).

I've noticed that too...except with my birds, they pretty much all can speak english...and DO... but wild birds, I agree, a lot of it has to do with body language and tone...But they aren't stupid animals...I'm sure from observing other species around them they learn alarm calls etc.

This is an interesting thought. I have been wondering this ever since Hemingway (QP) has started trying to flock call with Elvis (canary). This is quite humorous but I have been wondering what it means to the both of them. Elvis will start by making a little chirp and then my little green brutus in the other room responds.

Definitely has a lot to do with body language, like Carrie said. My quaker and my amazon communicate constantly..for example, whenever I am feeding a new fruit or food Tequila will ALWAYS wait for Kiwi to take a bite and observe his reaction to the food before she tries it. If he doesn't like it, she usually won't touch it

Silly birds!