Bees make a great sound; the pitch is steady, but the volume as they go buzzing around the mic changes constantly. Take a long sample, then slow it waaaay down until it's a low growl. Very cool.
A great example of this is at the beginning of The Exorcist. During the scene where Father Merrin walks through the ancient ruins, and comes across the statue of Pazuzu, the soundtrack has multiple layers of bees mixed at different levels to create the unearthly soundtrack which foreshadows the events to come.
Doc Siegal, the man who created the sound effects for the film, taught me that trick when I was a student of his in the '70's.
Great man. Great idea.