Merpati penumpang: Perbedaan antara revisi

[http://www.si.edu/resource/faq/nmnh/passpig.htm Smithsonian Institution]; it is believed that this species once constituted 25 to 40 per cent of the total bird population of the United States. It is estimated that there were 3&nbsp;billion to 5&nbsp;billion passenger pigeons at the time Europeans discovered America.</ref> Mereka hidup pada kumpulan besar, dan selama migrasi, mereka dapat terlihat, membutuhkan beberapa hari untuk melewati dan membawa miliaran burung.<ref>{{cite news |first= |last= |authorlink= |coauthors= |title=Three Hundred Dollars Reward; Will Be Paid for a Nesting Pair of Wild Pigeons, a Bird So Common in the United States Fifty Years Ago That Flocks in the Migratory Period Frequently Partially Obscured the Sun from View. How America Has Lost Birds of Rare Value and How Science Plans to Save Those That Are Left. |url= |quote=Unless the State and Federal Governments come to the rescue of American game, plumed and song birds, the not distant future will witness the practical extinction of some of the most beautiful and valuable species. Already the [[snowy heron]], that once swarmed in immense droves over the United States, is gone, a victim of the greed and cruelty of milliners whose "creations" its beautiful nuptial feathers have gone to adorn. |publisher=[[New York Times]] |date=[[January 16]] [[1910]] Sunday |accessdate=2007-07-21 }}</ref><ref>[http://www.findarticles.com/p/articles/mi_qa4128/is_200607/ai_n16537303 Ask]</ref>

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"Prior to 1492, this was a rare species."