What was it?

Not too long ago my girlfriend and I spent a great deal of time listening to the noise of animals around her yard. After some time we listened to a very peculiar sound. The best way I can describe it is, the sound of metal scraping. It was a very short, loud call from some type of animal. Every few minutes it would "caw" from a new location; we could tell it was on the move. All of the sudden the call got quite loud, then we heard the noise of a tree, or possible a large branch fall. All during this ordeal we could also hear heavy trotting. Does Reddit have any idea what we heard? I'm very stumped, and slightly intimidated. tl;dr - Fuckin Sasquatch?