Endemic bird of the day : Pearly-eyed Thrasher

Abstract

Caribbean Endemic Bird Festival (CEBF) day 81 poster, dedicated to the Meet the Pearly-eyed Thrasher. This belligerent and highly intelligent bird is found throughout many islands in the Caribbean basin, including The Bahamas, Turks and Caicos Islands, Puerto Rico, Virgin Islands, Dominican Republic, many Lesser Antilles Islands, Bonaire and Curacao. They occupy a variety of forest and scrub habitats from seashore to mountain tops. They also live in urban areas, farms, and orchards where they take advantage of crops, fruit trees, and man-made structures for nesting. Like a popular Caribbean phrase, the Pearly-eyed Thrasher is a ‘sometime-ish’ bird—sometimes bold and vocal and other times shy and secretive. Pearly-eyed Thrashers measure ~11-12 inches in length. They are medium to dark brown on top, and white with brown streaking below. They might be mistaken for a close cousin, the Scaly-breasted Thrasher, but can be distinguished by their large pale bill and conspicuous pearly-white iris, as well as subtle differences in streaking (the Scaly-breasted Thrasher is barred, not streaked, below). Males and females are similar in appearance, though females tend to be slightly larger. Juveniles resemble adults. Pearly-eyed Thrashers are a classic example of an avian “supertramp” – a highly successful generalist species that is able to colonize and exploit all available habitats, sometimes to the detriment of other resident birds. They feed on fruits, insects, small vertebrates, and even carrion. This famously aggressive bird also preys on eggs and chicks of other birds. Although they prefer to nest in cavities in trees, rock crevices and man-made structures, they may also build open-cup stick nests in trees, palms and other vegetation. In Puerto Rico, Pearly-eyed Thrashers compete for nesting cavities with the Critically Endangered Puerto Rican Parrot. Local names for these birds include Thrushie, Zorzal Pardo, Chucho, Truche, Grosse Give, Paw-Paw Bird, Sour-sop Bird and Mango Bird, the latter names for their deep love of these fruits. Pearly-eyed Thrashers sing one to three-note whistled phrases all day and into the night in the breeding season. They also utter several rough, guttural calls, “craw-craw” and a harsh “chook-chook.” According to the International Union for the Conservation of Nature (IUCN), Pearly-eyed Thrashers’ conservation status is listed as Least Concern. Their population sizes can fluctuate a lot, however, and they face predation by invasive species and habitat loss. Thus, they should be monitored, especially on small islands. As a complement to the poster, a coloring sheet is included.