Wooden whistle
From Discworld MUD Wiki
A wooden whistle is a simple musical instrument, on which tunes can be played. It can also be used by witches to summon lost fruitbats back to them.
Musical properties
The wooden whistle is a wind instrument, requiring the crafts.music.instrument.wind skill to play. A bonus of approximately 150 in this skill is required to play with average ability. Apart from the usual commands for musical instruments, you can "blow" a whistle.
Whistles and fruitbats
A witch may bond the whistle to her fruitbat, by using the syntax
cast Granny Benedict's Bond of Loyalty with whistle for <fruitbat>. Once this has been done, the fruitbat will return from any nearby room to the witch's location when the whistle is blown.
