Evolutionary Tree of Sperm Whales (IMAGE) Natural History Museum of Los Angeles County Caption This is the evolutionary tree of sperm whales, showing the relationships of extinct and living species, and when reduction of the spermaceti organ took place. Credit Natural History Museum of Los Angeles County 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.