This is for insects, spiders, small animals, etc. The beetle, lizard, and snake were found around my apartment - the beetle just outside my front door and the lizard and little snake were in my bedroom (the snake was IN MY BED when I found it). I have since had a hole behind the water heater sealed up, so hopefully the wildlife will stay outside from now on.

Update - I bought a condo in December, 2003. I have not noticed any big holes coming in from outside. I did find a very small toad in the living room in May, 2004 (did not have the camera handy at the time), but do not expect many other uninvited visitors here. ;-)