Thought this was good - taken from a book by Louis Mongello. There are many more in there too!!!!!!!!

<span style="color:navy">Soon after Future World opened, Cast members and Imagineers noticed that birds were making their nests in signs, eaves and on buildings. Needless to say it caused a bit of a mess and the birds often swooped down near guests to pick up food that had fallen to the ground. To alleviate the bird dilemma neturally, without actually having to go in and evict the "new tenants", Disney installed a series of hidden speakers to broadcast the recorded sound of a bird in distress. The sound is an alert to other birds that there may be danger in the area, which causes them to stay away. Have no fear though.......no birds were harmed in the making of the recording.</span id="navy">