Bird talk

A couple of birds are tweeting quite loudly from a nearby tree. One of them sings to herself a little morning song while the others seem to tell her with their tight strings of chirps, “Shut up, missy, it's 10:40 in the morning.” 

They continue to talk in bird, but I don’t understand bird.

While listening to the birds chirping this very moment, I just thought that It's hard to determine whether you really have feelings for someone, you are just carried away by good things he or she does. 

In other words, you can never say if you are returning the love, or just returning a favor.

Yeah ami, I know the bird chirping doesn't make sense.