 However, Pearly-eyed Thrashers (Margarops fuscatus) are aggressive competitors at fruiting trees, and may be potential predators of young and possibly adult orioles.In the presence of Pearly-eyed Thrashers, Montserrat Orioles often reduce vocalizations and become more secretive.The Montserrat Orioles song is a loud series of melodious whistles, but slow and methodical.