Iron Bird has a new item for sale, bee nest. This 3 prim nest is a home for a swarm of friendly bees. They won't attack avatars and are perfectly safe. Bees are relatively small, but still quite detailed. Each of them is 23 prims.
To make it possible to enjoy watching bees even with low amount of available prims, they can be temp-rezzed. This means that bee will emerge from the nest, fly around for a brief time and then be gone. Multiple temp-rezzed bees can be flying at the same time.
For those with enough of free prims, the nest can spawn non-temporary bees. These bees will fly around indefinitely time.
Bee nest comes with free updates. Everytime there is a new feature added or a bug squished (not a bee though), existing customers will receive new version, free of charge.
Price of the nest is only 75L$, real bargain.
Nest is available at XStreet SL: http://www.xstreetsl.com/modules.php?name=Marketplace&file=item&ItemID=958026
On-Rez: http://shop.onrez.com/item/798561
And in-world: http://slurl.com/secondlife/Blorkus/251/176/111