Once considered the most numerous bird on Earth with an approximate total of 3 to 5 billion in North America when Europeans arrived. Hunted as a cheap food supply source, the last known wild pigeon was killed in Ohio in 1900.
The last known passenger pigeon, named Martha, died September 1, 1914 in the Cincinnati Zoological Garden where a national landmark memorial stands today. The loss of the passenger pigeon was the first documented extinction of a species at the hand of man.
Here is a painting by Breah of the extinct passenger pigeon: see image