The folks at the San Diego Zoo want your "old or unused cologne and perfume":
The Behavioral Biology Division of the San Diego Zoo Institute for Conservation Research is currently conducting a research project examining individual and species enrichment preferences for large felids (lions, tigers, and cheetahs) at the San Diego Zoo Safari Park (see post, Big Cat Preferences, Part 2). Based on some preliminary results, we are interested in learning more about different scents (perfumes) that attract the animals and promote the behavior of exploration.
For information about how to donate, go here. Many thanks to odonata9 for the link!