How do Manx Shearwaters Puffinus puffinus Find their Burrows?


Department of Veterinary Anatomy, University of Saskatchewan, Saskatoon, Sask., S7N OWO, Canada.


The ability of Manx shearwaters (Puffinus puffinus) to locate their nesting burrows at night was investigated using observation and experiments. Shearwaters walking to their burrows did so at random with respect to the wind direction, and did not vocalize, suggesting that visual cues are important to successful burrow homing. Experiments to test whether vision, audition or olfaction functioned in guiding birds back to burrows supported this conclusion.