Joel Greenberg visits the Bird Division to study the Passenger Pigeons and associated material in our collection for his book and Passenger Pigeon project. These birds belonged to William B. Mershon, and were mounted in the same pose as Audubon's painting. These birds probably date from around 1900. See http://passengerpigeon.org/states/Michigan.html for information on the Passenger Pigeons in Michigan. Photo by Jim Gapczynski.