I recently posted about how Léa had picked up Petey's "Hi Petey!". When we heard it, twice, it was just out of the blue, there was no real context as to why she said it, she just did.
However, last Friday evening, while the birds were in their cages and I was in the adjacent room, I heard a conversation which went back and forth between Petey and Léa. For most of it, Petey would say "Hi Petey!" and Léa would answer right back at him with a "Hi!". Eventually though, while Petey continued with "Hi Petey!", Léa switched it up and actually responded to him with a few "Hi Petey!" herself. It was quite cute to listen to!