The EQ of female sperm whales is more than double that of males (1.28 for females versus just 0.56 for males). This extraordinary degree of dimorphism is unique amongst mammals. And, as with the orcas, it is thought to be connected to the female’s increased need for social intelligence. Male sperm whales are solitary creatures, whereas females live in large families in which social interactions and inter-individual communication are essential. When it is time for courtship, one can only imagine how limiting a female sperm whale must find conversation with the male.
