Who Trained the Movie Birds?

I don't see any screen credit for the bird "wrangler."

Whoever did it, especially training that little sparrow, deserves credit.

I also wonder if the dying canaries were real, and if so, how they did that (gas? old birds?)

and... if the baby sparrow was a puppet.

Anyone have any insights?

Trolls, please skip this one and go back to your video games, ok?