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The Sight

The Cayman blue iguana

The Cayman blue iguana at Queen Elizabeth II Botanic Park on Grand Cayman.

DAVID LYON FOR THE BOSTON GLOBE

The Cayman blue iguana at Queen Elizabeth II Botanic Park on Grand Cayman.

The Cayman blue iguana, shown here at Queen Elizabeth II Botanic Park on Grand Cayman, was nearly extinct two decades ago, but the species has rebounded through the National Trust’s breeding program.

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