That's the call that the juvenile barred owls use when they are begging for food from their parents. Notice the downy feathers still on the head. I hear that every time our pair is feeding their newly fledged young near our house.
I hear this every night in my backyard! I saw the massive mom in my front yard catch a rabbit. I immediately heard the screeching amplify in my backyard and then spotted two juveniles together in the tallest tree! Sooooo cool!
I heard the barred owl calling the two juvenile owls they are far away and they come near the tree that is by exit gate they stay there all night is until 5 am