'Sham Mating' of the Lampreys (video) Hokkaido University Share Print E-Mail Loading video... Caption This is the 'sham mating' of the lampreys. The lampreys frequently mate without releasing eggs. Credit Yamazaki C, Koizumi I. Journal of Ethology, January 19, 2017 Usage Restrictions None Share Print E-Mail 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.