Perhaps like me you have heard those sounds from overhead during the spring and fall bird migrations and looked skyward to see what was causing it. But nothing was up there! But then it continued. Eventually a flock of birds was spotted up there. Way up there! And they could seemingly disappear and reappear depending on the lighting. If they happened to be flying a little lower, you would have noticed that they were large birds with a long neck and legs sticking out behind. They are sandhill