bird study – आवारा मुसाफिर

Study documents extinction of 610 bird species and ecological impacts

October 5, 2024107 Views

The Dodo, the famous flightless bird that inhabited the Indian Ocean island of Mauritius, is a case study in extinction caused by humans. The Dodo, finely adapted to its isolated ecosystem but unprepared for the arrival of people, was first encountered by Dutch sailors in 1598. Hunting, habitat destruction and the introduction of non-native species doomed it in under 80 years. It is hardly alone. New research has documented the extinction of 610 bird species over the past 130,000 years, coinciding with the global spread of our species Homo sapiens, an avian crisis that has only accelerated in recent years and decades. For instance, the Kauaʻi ʻōʻō, a Hawaiian songbird, was declared extinct just last year. The researchers also revealed the ecological consequences, as the disappea...

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Old World flycatchers’ family tree mapped

AWARA MUSAFIR BUREAU

November 26, 2022148 Views

The European robin’s closest relatives are found in tropical Africa. The European robin is therefore not closely related to the Japanese robin, despite their close similarity in appearance. This is confirmed by a new study of the Old World flycatcher family, to which these birds belong. The study comprises 92 per cent of the more than 300 species in this family. “The fact that the European and Japanese robins are so similar-looking despite not being closely related is one of many examples of so-called convergent evolution in this group of birds. Similarities in appearance can evolve in distant relatives, e.g., as a result of similarities in lifestyle,” says Per Alström from Uppsala University, who is one of the researchers behind the study published in Molecular Phylogenetics and E...

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Migratory birds have lighter-colored feathers

AWARA MUSAFIR BUREAU

December 7, 2021596 Views

Migratory birds are specially adapted to find their way over extreme distances that represent remarkable tests of endurance. Now, researchers reporting December 6 in the journal Current Biology have discovered an unexpected way that migratory birds keep their cool during such arduous journeys: lighter-colored feathers. "We found across nearly all species of birds, migratory species tend to be lighter colored than non-migratory species,” said Kaspar Delhey of the Max Planck Institute for Ornithology, Seewiesen, Germany. “We think that lighter plumage coloration is selected in migratory species because it reduces the risk of overheating when exposed to sunshine. Lighter surfaces absorb less heat than darker ones, as anybody wearing dark clothes on a sunny day can attest! This would be pa...