A link to a recent article in the Guardian which focusses on the key points in BirdLife International's report The State of the World's Birds - https://www.theguardian.com/environment/2018/apr/23/one-in-eight-birds-is-threatened-with-extinction-global-study-finds This report is published every five years, and - perhaps predictably given the state of the world we live in - each report tends to describe a worsening situation c.f. the previous report. As Tris Allinson, senior global science officer for BirdLife International notes “The species at risk of extinction were once on mountaintops or remote islands, such as the pink pigeon in Mauritius. Now we’re seeing once widespread and familiar species – European turtle doves, Atlantic puffins and kittiwakes – under threat of global extinction.” Another species which immediately springs to mind to an Hong Kong observer is Yellow-breasted Bunting. This species is, in fact, referred to in the article, a comparison being made with the Passenger Pigeon. The Yellow-breasted Bunting has been hunted/trapped to the verge of extinction. Yet "Hunting and Trapping" is only the fourth most important threat to birds. At the top of the list is "Agriculture" followed by "Logging", although in many cases in the Third World these two are obviously interconnected.
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