How to know if its a fledgling or nestling Gray Catbird?

We have found one and we dont know what to do with it. I heard we should put it back in the nest problem is we dont know what tree since it was just on the road. He seems to hop around and cry a lot. He looks kinda like this................. http://www.placeforwildbirds.com/ look in bird gallery photo then go to gray cat bird and he looks like the first pic shown