Great Southern White butterflies, bolstered by an El Nino-induced baby boom, are fluttering through Palm Beach County and the Treasure Coast, headed north with the Snowbirds.

"I saw flocks of them flying together across the water near Cove Road in Port Salerno," said Ken Gioeli, natural resources agent at St. Lucie County cooperative extension office.Gioeli said more are hanging out at the office's butterfly gardens west of Fort Pierce. Agent Gene Joyner said he's seen some at Mounts Botanical Gardens in West Palm Beach. Ron Boender, owner of Butterfly World in Coconut Creek, has seen the white-winged insects "everywhere."

The coastal butterflies breed in salt marsh areas, said Thomas Emmel, butterfly expert at University of Florida in Gainesville.