My desert tortoise often comes to the Arcadia door and acts like he wants to come in. We never let him, although he is really cute. I honestly think it's just part of their need that "if I can see through it, then I want to go through it."
Funny, I just found it for the first time yesterday. I found it intriguing, until I found out how many seasons this show had been on. Still, I watched a few episodes, because it kept promising a finale (or so I thought). Finally turned it off, but it seemed like a fascinating subject.