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CHICAGO (AP) — Some endangered birds could ground a Chicago beachfront music festival proposed for late August.

Promoters of Mamby on the Beach are seeking a permit from the Chicago Park District to move the show to Montrose Beach on the city's north side. But two piping plovers lately have been making the beach their home. Four eggs were discovered and turned over to the Lincoln Park Zoo this week.

Louise Clemency of the U.S. Fish and Wildlife Service says the plovers are hanging around and appear to be making a new nest. The Chicago Sun-Times and Chicago Tribune report that objections to the music festival go beyond the birds.

Promoter Jerry Mickelson says it's possible the show could move off the beach due to high water. A permit hasn't been approved yet but tickets already are available.