Guillemot Eggs (3 of 3) (IMAGE) Society for Experimental Biology Caption Guillemots are famous for the egg shapes -- when knocked or rocked, they go around in a perfect circle on their own axis, so they don't roll off the cliff. Credit Steven Portugal Usage Restrictions None License Licensed 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.