Want to entertain a kid? Give her a refrigerator box.
A cat? Give him a paper grocery bag.
A lamb? A black, feed tub.
It takes lambs about two days to figure out that the feed tub is prime real estate.
When the ewes step away from the hay, the lambs jump in. The oldest lamb, the white single ram, grabs a spot first.
A game of musical tub ensues, with the other lambs jumping in and out, until finally, a few more lambs settle in.