I assume everyone is aware of the recent problems at Chicago's Lincoln Park Zoo. The investigation into several animal deaths has pointed to, unfortunately, the toxicity of a common plant in the deaths of some animals.
Here is an article that says (too little) what's happening:
Rob Halpern
Zoo Horticulture
Consulting & Design
19 Meadowbrook Drive
Ossining, New York 10562
914.762-6569
914. 945-8915 FAX
www.ZOOPLANTMAN.com