Professor John A Endler’s recent bowerbird research about male bowerbirds using forced perspective to make their displays more speccy has been reported in Science Daily. Basically they arrange larger objects
http://www.sciencedaily.com/releases/2010/09/100909122801.htm
The original article: John A. Endler, Lorna C. Endler, and Natalie R. Doerr. Great Bowerbirds Create Theaters with Forced Perspective When Seen by Their Audience. Current Biology, 2010; DOI: 10.1016/j.cub.2010.08.033
This is not Endler’s work but an interaction I did with bowerbirds at Broome Bird Observatory