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Her person is a vet, and she acknowledges in various places[1] that it's unclear whether Billi pushes the buttons to form meaningful sentences, or simply because she knows something happens when she presses them (like she'll get some sort of attention).

I can imagine there are some buttons where she might associate the button press with a specific outcome (like, she knows that when she pushes her "food" button, there's a good chance of her getting fed). But whether Billi understands that her getting fed is because she's intentionally communicating with her person is unclear.

Either way, I think the channel is mostly for fun, and my partner and I have appreciated it a lot during the pandemic. Billi had a scary health crisis a couple of weeks ago but looks to be mostly recovered now, thankfully

[1] One of those places is this FAQ page https://www.billispeaks.com/faq