Appellate Decision Includes Ostrich Photo

As noted here previously, Judge Posner does not take poor briefing lightly. This time his critique is supported by visual aids!  

Writing for the Seventh Circuit in Gonzalez-Servin v. Ford Motor Company, issued on November 23, Posner critcizes appellants in the consolidated cases for failing to properly address dispositive authority.  Posner writes:  “The ostrich is a noble animal, but not a proper model for an appellate advocate.”  To underscore the point, he includes both an image of an ostrich and one of a suited man—both with heads buried in the sand.

Any idea how to cite a photograph in a judicial opinion?  Ostrich, slip op. at 5??