Grams, K.; Roletto, J. 2001. Enrichment options: Tamarins, rhinos, meerkats, fishing cat and bears. Animal Keeper's Forum 28 (5): 206-207, 2 plates.
Ziegler, G.; Roletto, J.; Hays, T.; Gunder, B. 2000. Enrichment options: (Rhino and the snowman). Animal Keeper's Forum 27 (6): 264-266, 3 plates.
Ziegler, G.; Roletto, J.; Sponholz, C. 2000. Enrichment options: Scavenging vultures (on bones of Southern White rhino). Animal Keeper's Forum 27 (10): 452-453, 1 plate.






