the last passenger pigeon died in 1914.
The two primary causes of extinction are considered to be habitat loss due to increase in European migration across the United states as well as hunting of the bird as a cheap and prevalent food source for slaves and poor.
The extinction of the passenger pigeon was due to two factors primarily. First, there was the elimination of their habitats by European settlement. Second, pigeon meat was increasingly used as a cheap food source (mainly for slaves) in the 19th Century, this led to over hunting and eventually extinction by 1914.
There were three combining factors that caused the extinction of the passenger pigeon. The first was over-hunting, and the second was habitat destruction. There was also a bird disease at the time called Newcastle Disease, which may have added to the species’ extinction.
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