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Conceptualizing a plumage aberration such as leucism, where pigments are prevented from reaching some (or all) feathers (in the case of birds) may be a feat of the imagination that can most easily be applied to one of the more common species – maybe an American Robin , or a Rufous-bellied Thrush.
It divides countries into categories, where the next category has 200 more species. In some cases the data are outdated, e.g. Costa Rica has 900 and not 800 species, but I made no corrections, remaining faithful to the original map data. Shown as a list, it looks like this: Less than 200 bird species: Antarctica; oceanic islands.
At the moment, night excursions to Poas are limited by pandemic driving restrictions but I can still surmise about the species flying overhead. This fall, I have had the fortune of listening to both species calling at the same time from the back balcony. Cuckoos are up There. At times, Red-eyed Vireos can be just as abundant.
During this time, the fish trapped in the shrinking pools of water attract hordes of herons, egrets, storks, and other wetland species. Raptors such as Savanna Hawk , Snail Kite , and Black-collared Hawk and up to five species of kingfisher also join the bonanza in one of the world’s great birding spectacles.
They are the only birds able to fly backwards and the 340-odd species come in many different forms. Its partner is the well-known Ruby-throated Hummingbird , one of the only species of hummingbird that migrates every year. In fact it might just be one of the drabbest hummingbird species out there.
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