Distribution map of the Passenger Pigeon (<i><a href="//commons.wikimedia.org/wiki/Ectopistes_migratorius" title="Ectopistes migratorius">Ectopistes migratorius</a></i>). In orange: normal zone. In red: breeding zone.
Valérie Chansigaud
CC BY-SA 1.0
Own work, based on map compiled by researcher Arlie W. Schorger in the early 1950s (published in Schorger, A. W. (1955). The Passenger Pigeon: Its Natural History and Extinction. Madison, WI: University of Wisconsin Press. <a href="//commons.wikimedia.org/wiki/Special:BookSources/1-930665-96-2" title="Special:BookSources/1-930665-96-2">ISBN 1-930665-96-2</a>.)