Santiago also established an environment-protection program, assigning seven percent of Comerío's terrain for conservation in order to protect the Puerto Rican Plain Pigeon, an endangered bird species.
The Plain Pigeon is thought to represent a fairly recent island adaptation of the Red-billed Pigeon (P. flavirostria) or the Maranon Pigeon (P. oenops), found in Central and South America.
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Juveniles are browner overall, with pale wing margins and dark eyes.
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