"Build it and they will come"--definitely applies to rabbit manure and worms! Almost any earthworm will take one whiff and head thataway in little chuckwagons lettered with "BUNNY OR BUST".
I have over 100 rabbits, and my worms handle every bit of the waste. (I had to deny my neighbor some this year--he uses the bunny poo for his garden -- and the worms were running short!)
I was absolutely astounded by the results of my going through one of the beetle bins yesterday--despite repeated nightly freezing temperatures, there were no more dead beetles than there were in midsummer! They're a bit slower, and the substrate *had* molded somewhat, but overall everyone looked pretty good. I moved all live beetles to fresh bran and gave 'em an apple, which they seemed to enjoy more once I laid a string of nice warm christmas lights across the bin to add a little warmth.
For those who have very small numbers of worms, I strongly suggest--stock up! The investment in a thousand or more will run you perhaps twenty dollars and supply your chickens for years to come if all goes well. Just remember that for each dead beetle you pull out of the colony, you need to replace it with one or two more, and hold back mealies to grow on out accordingly. I do err on the side of holding back more than I probably really need. The rest...well, the rest are chicken feed.