Obligatory Nocturnalism in Triassic Archaic Mammals: Preservation of Sperm Quality? (image) University of Chicago Press Journals Share Print E-Mail Caption Obligatory nocturnalism in triassic archaic mammals: preservation of sperm quality? Credit Barry G. Lovegrove Usage Restrictions reuse with permission 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.