We talk to our pets all day every day. Tabitha our tabby cat talks back to us, its actually like we are having a conversation, and Fred will answer if we call his name with a little mew. (He's a bit of a wuss and his mew is very high pitched. I think I had his bits cut off too early!) Every time I go outside, I call the boys, say hello and wave, and on hearing my voice (and OH's too) he jumps up on to the roof of the henhouse and starts to cockle.
If the animals didnt talk, it would be very quiet indeed around here!