Talk:Bird conservation
 | A fact from Bird conservation appeared on Wikipedia's Main Page in the Did you know column on 1 April 2007. The text of the entry was as follows:
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Hi. Nice article. jimfbleak 06:22, 28 March 2007 (UTC)
A billion a year? Really?
editI think the claim that almost a billion birds per year are killed as a result of collisions with structures requires some sourcing. Extraordinary claims require extraordinary proof, as they say. Unless that's just a missing decimal point I don't see there. —Preceding unsigned comment added by 71.32.55.142 (talk) 12:03, 8 January 2009 (UTC)
- Found the actual estimation source - here is the extract from Daniel Klem, Jr. (1990) Collissions between birds and windows: mortality and prevention. Journal of Field Ornithology 61(l):120-128: Shyamal (talk) 09:21, 28 February 2013 (UTC)
"One annual estimate of avian mortality resulting from strikes is 3.5 million for the United States alone (Banks 1979). This figure is based on the assumption that 1 bird is killed per square mile of land per year. My findings of multiple windowkills at several man-made structures of various types in urban, suburban, and rural settings, throughout every season, and under almost every weather condition suggest this is an extremely low figure. Admittedly no less speculative, I offer an alternative based on the criteria that 1 to 10 birds are killed per building per year in the U.S. Attempting to be conservative, I used U.S. Bureau of Census (1986) data and estimated the number of U.S. buildings by assuming each housing unit (93,519,000), commercial building (3,948,000), and school (96,626) equated to 1 building each; this yields an annual windowkill toll of 97.6 to 975.6 million birds. The estimate is fundamentally speculative because it assumes U.S. buildings that kill no birds are compensated for by those that kill many."
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750-1800 Species of birds extinct is innacurate and an old now innacurate estimate.
editThere has been a new accepted study that showed that in fact 750-1800 species did not go extinct since the end of the Pleistocene or the start of the colonisation of the Pacific islands by humans. The old estimate is from 2006 from a book written by another ornithologist that has been recently disproven.
This is the new study that stated that only around 4% of all birds that ever existed went extinct since 50,000 years ago, no mentions of thousands of birds extinct on islands, and it is a supported study by many scientists. It also says that at least 469 extinctions have occurred since 50,000 years ago (the end of the pleistocene), most of them large flightless birds on islands, yes, they claim that there could be more waiting to be found in fossils but it is very highly unlikely that the number is above 100 more. Also only 48 bird species have gone extinct on continents (including australia) the rest are only on islands.
I suggest updating the information with this new source and deleting the old and erroneous information. It is highly unlikely the number of extinct species is above 4-5% of the total. Also the bird biodiversity in the pacific islands is still rich with thousands upon thousands of birds living there today. I say we update it. Just wanted to put this out there to start a discussion.
https://onlinelibrary.wiley.com/doi/abs/10.1111/jbi.14206 86.124.25.38 (talk) 13:39, 26 April 2023 (UTC)