I used to live in the Dandenong Ranges (in Victoria), and we had a local lyrebird that would mimic the frequency of our remote garage door. The sound was too high for most humans to hear, but we would see it singing near the garage, and the door would be opening and closing. .. and lyrebirds are impressive enough even without the editing. Watch this: http://www.youtube.com/watch?v=WeQjkQpeJwY SOURCE: Royal Zoological Society of South Australia