Figure 2a. Three environmental enrichment devices for calves: chain, ball, and Calf Lollie (PVC pipe mounted to the side of pen, located above the calf in this picture).

Figure 2a. Three environmental enrichment devices for calves: chain, ball, and Calf Lollie (PVC pipe mounted to the side of pen, located above the calf in this picture).
Morrow-Tesch, Julie. "Environmental Enrichment for Dairy Calves and Pigs," Animal Welfare Information Center Newsletter, 7(3):3-8, Winter 1996/1997.