https://digitalcommons.usf.edu/wilson_bulletin/vol53/iss4/19/
"The Bronzed Grackle's Method of Opening Acorns" by A. W. Schorger
By A. W. Schorger, Published on 12/01/41
https://archive.org/details/passengerpigeoni0000scho/mode/2up?q=40
The passenger pigeon ; its natural history and extinction : Schorger, A. W. (Arlie William),...
xiii, 424 p. : 24 cm