Black object near a flock of birds, looked like floating paper but was too big and then proceeded to move straighter and faster. Oval.There was a strange shape around a flock of birds I noticed and it was bigger than the birds. The object seemed to move left to right as if it were a big plastic bag moving through the sky. But then it moved in a straight line and moved quicker.It was like a oval in shape from where I could see it but it had a indent on the side. The object was about 3 times the size of one of the birds in the flock nearby. The object was black as seen under a blue afternoon sky. The object headed east from the sighting area.