By Mark W. Oberle
600DPI test
The first e-book to demonstrate in colour photos all breeding birds and commonplace migrants of Puerto Rico and the Virgin Islands--- now in its 3rd variation. Over four hundred colour photographs of 191 species of birds are integrated. The English textual content is designed for college kids, lecturers, and birdwatchers who are looking to comprehend the traditional history of Puerto Rico and the Virgin Islands via studying approximately their attention-grabbing birds. The species' existence histories are written for the overall reader, and contain vital classes for conservation of our average assets. Over a hundred expert and novice ornithologists collaborated during this attempt. The ebook comes with a CD-ROM with Spanish and English lifestyles heritage money owed and audio clips of over four hundred species, plus over 2,900 images, net assets, birdfinding info, essays on evolution and conservation, and an in depth bibliography. All species of Puerto Rico and the Virgin Islands, plus such a lot birds of the Lesser Antilles are incorporated. The CD-ROM is written in HTML, for laptop and Macintosh pcs, and permits effortless use for pupil initiatives in biology, tune, and paintings.
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Additional info for Puerto Rico's Birds in Photographs
Example text
The call is a high-pitched, pipping note. The male builds several sandy, scrape nests, and tries to attract a female with a courtship dance in which he spreads his wings low and dances around her. Both sexes share in incubating the three eggs for 24-25 days, the female doing most o f the incubation in the daytime. Young leave the nest soon after hatching, and fledge after 3-4 weeks. A common, permanent resident. Its ground nest is easily disturbed by humans or predators. Breeds along the southern coasts o f North America south to northern Brazil and Colombia.
In fact, a popular expression in Puerto Rico is “cada guaraguao tiene su pitirre” which means, “every hawk has its kingbird” [pestering it]. The Red-tail has a dramatic courtship flight, with the male and female calling, circling each other, and soaring high in the air. The call is a descending “keeer,”like steam escap ing from a boiler. Its nest is a large jumble o f sticks in the crown o f a tree and contains 2-3 white eggs. Both sexes build the nest, incubate the eggs and feed the chicks. The incubation period is 28-35 days, and the chicks leave the nest 42-46 days after hatching.
The subspecies experienced a 40% decline in population from 1985 to 1992. Although the regeneration of natural forest since the early twentieth century has helped this bird, recent deforestation due to construction o f roads, power lines, and communication facilities, have reduced habitat. ). Pearly-eyed Thrashers may prey on hawk nests directly, but also rob the nests o f small birds and thus may reduce bird popula tions that the hawk depends on. Sharp-shinned Hawks will occasionally kill young chickens, and as a result, farmers have persecuted the hawks.