Photo: Duckweed swirls in the swampy waters of Florida's Big Cypress Reservation. (Photo by Jack Dykinga)

See more of Everglades National Park: http://on.natgeo.com/X4AOZF
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National Geographic
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Duckweed swirls in the swampy waters of Florida's Big Cypress Reservation. (Photo by Jack Dykinga)

See more of Everglades National Park: http://on.natgeo.com/X4AOZF

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