Illustration of a female Passenger Pigeon. I scanned it from the following publication--now in the public domain:Source Orthogenetic Evolution in the PigeonsDate of publication: 1920Author: Hayashi and Toda (artists), Charles Otis Whitman (author).Information also on file at Wikimedia Commons.This image is in the public domain, but Flickr does not have a setting for that license--so I have given it the least restrictive Creative Commons License.FCN2P29CA