Strange Creature Caught on Tape - Mothman? Alien? Flatwoods Monster?

We saw this thing from the window, crouching in the dark in our backyard. It got spooked when we turned the light on and then we went to see what it was--thought it was a cat or fox or something like that at first. It moved to the end of the backyard--not sure how to describe it. It didn’t run or walk or fly or scamper or whatever animals usually do, and then disappeared over the fence. Literally disappeared. The video sucks but you can see it clearly when it takes off and then when it flies up over the fence at the end. We still have no idea what it was, but needless to say, we haven’t gone into the backyard at night for a long time.