Make no mistake about it: Birds use language knowingly.
Like the parrot that calls, "Here kitty, kitty, kitty" to get the cat to come. Or the bird that says, "I'm starving!" when it's time for dinner. Or the bird that tells another squawking bird, "Be quiet, please!"
Did you know that male parakeets, properly known as budgies, are prodigious talkers, but females don't learn to speak?