Most of the photos on this site were extracted from reference images (high-resolution tiffs, 20 to 200 megabytes in size) from the Library of Congress research archive. (To query the database click here.) Many were digitized by LOC contractors using a Sinar studio back. They are adjusted by your webmaster for contrast and color in Photoshop before being downsized and turned into the jpegs you see here.

Puerto Rico, December 1937. "The beginning of the cockfight. When the man in the center raises the cloth, the birds will see each other and begin to fight." Medium format nitrate negative by Edwin Rosskam for the FSA. View full size.
...and it leads to cat juggling.
Cockfights were still allowed in Puerto Rico, at least when I visited a few years ago. I tend to doubt the spectators would be dressed in so dapper a fashion nowadays, though.
Today's Top 5