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