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Biology

Sexual Dimorphism and Reproductive Strategies in Elephant Seals

Quick fact

On average, male southern elephant seals are about five to ten times heavier than females, with a bull weighing as much as 4,000 kilograms (8,800 pounds) compared to a cow's 400 to 900 kilograms (880 to 2,000 pounds).

Why this is interesting

Imagine a male elephant seal weighing as much as a pickup truck, while the females he is trying to woo tip the scales at less than a tenth of his weight. How did such an extreme difference evolve?

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Sexual Dimorphism and Reproductive Strategies in Elephant Seals

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