The day after he was brought home, I heard Mojo growling, low and behold, someone was outside our door. The past few days he's been growling and I thought it was just random, at nothing in particular. As I'm sitting here, he starts growling again so I go to peek out the window and realize that our neighbor.. 2 houses down on the street across from us is walking around outside. Now I'm wondering if when he was growling before it was because someone was outside.. just not directly outside. Wow. Maybe I should leave his cage uncovered at night to keep watch!