DaVinci says his first words

I've been trying to teach my bird DaVinci to talk. I kept repeating a few phrases to him, but one of then seems to have caught his fancy.

Here he is saying "How does a cat go? Meow" over and over again.

John is now trying to confuse him by telling him a cat goes Woof Woof, and I am also trying to go on to teach him that a bird goes Chirp Chirp.

If you notice right around the time 3:59 in the following video he does say something other than meow. Is it Woof Woof or Chirp Chirp?

The video is a little less than 5 minutes. He does seem to get a little clearer by the end of the video.
I am, by the way, in the room at the back of the video sewing. You can here the click click of my sewing machine.
I set the tripod up to get this.