Katherine Ayres, University of Washington (image) University of Washington Caption In a boat trailing a distance behind killer whales, Katherine Ayres handles Tucker as he zeros in on the scent of whale poop. Tucker never goes into the water, he just leans over the bow in the direction the boat should travel once he detects the scent of whale scat. Credit Jeanne Hyde Usage Restrictions Credit required 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.