Various types of whistles
Aussie Slimline Thriller Whistle
A regular whistles with a variety of different uses, such as train platform attendants, sports referees, rigging communication and many more.
Generally used by the Navy and Marine scouts (The boatswain's call).
Fox Decoy Whistle
Makes a sound which mimics a rabbit in distress, and is used for attracting wild foxes at night. As such, it is generally used by hunters who wish to hunt foxes.