Well my comment was somewhat meant in jest, if you are running a test trying to find a connection, then you probably will find one, even if it doesn't exist. If you're looking for a specific pattern, your test will probably be good. But if you're looking for any pattern, well, patterns are everywhere, and you're going to find a few just because you're looking for one.
The reason they use specific animals in testing is because what they are testing for works close to the same as it does in people. For example, mice (for reasons I don't understand) have an immune system that's almost identical to humans. Rabbits have very similar eye reactions to irritants so they are used to test cosmetics.