Whenever I turn into my driveway at the end of the day, I can hear my birds in the backyard squawking away - they don't do that til they hear my car - according to my daughter who is home during the day, they are quiet otherwise, til they hear my car enter the driveway and shut off the engine, I can here them - 3 chickens can make alot of noise, if they're spoiled enough and know I'm home. So I go out to say "hello" and give them a warm treat and talk with them. They settle down and are fine. Do they know when I'm home by the sound of my car? I had a cockatiel when we had a place we rented in Fla. which was on the 6th floor. I would go out from the outer island to the mainland to shop etc, and when I returned I had to call up to the apartment to get let in (security reasons) at the gate, and when I got into the apt my husband knew I was almost home by the cockatiel squawking frantically - he would look out the kitchen window, and my car would be pulling into the parking lot, six floors below, but that bird knew I was home. I think our pets know us so well, that they listen and see everything we do (after all we are their food source) and know our sounds and voices to the point that they expect us at a certain times during the day and anticipate it. I think that's sweet.