Could he have gotten through the screen? The top has a mesh screen on top because I have cats and I don't want them getting into the terrarium and bothering the tadpoles or eating the plants. It's also got a lip of plastic on it all the way around the top so he'd have had to be totally inverted to reach an escape route.

Here's a photo of the setup:



That seems like an awfully long way for such a tiny creature to climb, not even including the upside down hanging he'd have to do. Is it possible?