Used to give birth more often (IMAGE) Aarhus University Caption The southern right whales used to give birth every third year, but because of the lack of food five years passes between every birth. Credit Fredrik Christiansen. Usage Restrictions May only be used in communicating this story. License Original 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.