FYI here is a live security camera somewhere on the US-Mexico border in Texas:
http://blueservo.net/camload.php?camid=6&frameid=8
At night you can see bats flying around, sometimes up close. For security reasons they don't say exactly where the camera is located.
You have to create a free account in order to see the live stream. But it is fun to watch the bats flying around.

