[JohnZ]

They're coming in through the pvc vent pipe on your roof. Watch out for the large (4 - 5 inch) variety as they are probably the Cuban tree frog and are toxic to touch. I often see 'em on our garage door and villa walls at night. The little native green tree frogs (1-2 in.) are harmless (these are the little "peeps" you hear at night about this time of year). The Cuban actually eats the native species.....so if you see them, they're probably hunting the little native guys.

Here's a link you might find interesting.
http://dsc.discovery.com/news/2007/0...tegory=animals