A wide game with a bird and beetle theme
You need 4 bases.
These are birds nests, and each bird nest has a baby bird in depending on your numbers. One parent bird. The rest are beetles. The parent bird has to catch a beetle, take it back to the nest to feed the baby bird. The beetle then becomes the baby bird. Once fed the baby bird can fledge the nest and also catch beetles. This means that only 4 Beavers are in nests at any one time, and then for only a short time.