Testing tunnel (VIDEO) University of British Columbia This video is under embargo. Please login to access this video. Caption University of British Columbia zoologists observed how hummingbirds reacted to a variety of visual stimuli using a four-metre flight tunnel. Credit Roslyn Dakin Usage Restrictions N/A License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.