Spectacular Ontario 'bird doughnut' pops up on U.S. weather radar

Spectacular Ontario 'bird doughnut' pops up on U.S. weather radar Ontario Weather

While rarely as perfectly concentric as the one spotted on Sunday morning at Long Point, The U.S. National Weather Service says that roost rings do happen with some regularity along migratory paths.

"Beginning around the middle of summer, curious expanding doughnut patterns often appear just before sunrise... These features, known as 'roost rings,' occur when the radar beam detects thousands of birds taking off from their roosting sites around dawn to forage for insects,""Leading up to fall migration, a number of bird species are known to gather at large communal roosting sites, which are often detected by NWS Doppler radar.

"Purple martins typically return to the same roosting sites in the evening, which are usually situated near bodies of water. As a result, the roost rings are often observed on radar at the same locations over the course of several mornings."

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