Photograph by Tord Karlsen Barba. Photograph by Tord Karlsen Jonathan Gordon, who has spent the past 30 years studying sperm whales and is a Research Fellow at the University of St. Andrews’ Sea Mammal Research Unit, understands this is due to feeding opportunities. “Males leave as they mature and are found closer to the poles. The feeling is that the feeding must be better as they tend to grow a lot larger than females,” he says. “But if you ask for hard evidence that the feeding conditions are better, well – there really isn’t much.” Tiu Similä, a Finnish scientist who pionee...