Trisha,
I remember reading somewhere on geocaching.com about the Cache Larva.
The intent is to form a new cache from the contents of the container
and include the larve in the new cache - or something like that. I
don't remember exactly where I read it. The information may have been
on the cache description page for the first such cache. I suggest you
inquire on the forums about it. I'm sure you'll get a response there.
Bob