Roost rings: Massive flocks of birds visible on Metro Detroit radar Saturday morningPublished: August 8, 2020, 7:23 amLocal 4's Paul Gross explains the large rings visible on Storm Tracker 4 Saturday morning -- and, believe it or not, they're made of birds.

DETROIT After making an appearance Wednesday, roost rings have cropped up again on the Metro Detroit radar Saturday morning. Local 4s Paul Gross says the rings are large flocks of birds waking up at dawn and flying away in all directions. See the roost rings in action on our Storm Tracker 4 radar in the video player above. More: Metro Detroit weather: Cool start to sunny summer SaturdayTrack the radar:

Its a bird, its a plane -- no, its a lot of birds! Youve seen random things pop up on radar over the years, including fish-flies, which takeover Metro Detroit in June. Now, the radar has gone to the birds. Local 4s Paul Gross noticed these things called Roost Rings on radar, popping up over Southern Ontario and Monroe County. These rings are large groups of birds waking up at dawn and flying away in all directions, Paul said on Twitter.