The Cat Tracker Project seeks to use data collected by citizen scientists to better understand the personalities, relationships, diets, and territorial roaming of house cats.  The project has 3 ways to participate with information about your own cat by completing a personality survey, participating in GPS tracking (and viewing the results of other cat tracks), or by submitting hair for isotope analysis to examine their dietary preferences beyond the food bowl.  From cattracker.org:

Your cat has a secret life…

Cats are mysterious, dangerous and far more unpredictable than one might expect from an animal that is, theoretically, domesticated. Some of the mysteries of cats relate to where they go and what they do; this is especially true of cats that go outdoors. We open our doors. They leave. Just where they go, we can’t be sure. Or rather we couldn’t be sure, until now. With your help, we’re investigating the movement of domesticated cats across the landscape. We want to know: Where do they go? What are they eating? Why do they do what they do?

Learn more about The Cat Tracker Project (and see some great images of some of the feline participants along with maps of their GPS roaming) by visiting their site here.