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Articles on Animal behaviour

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The male bluehead wrasse defends his group of yellow females, one of whom has to step-up and take charge if he leaves. Kevin Bryant

What we learn from a fish that can change sex in just 10 days

When a male bluehead wrasse is removed from the group he dominates, the largest female changes sex, rapidly transforming ovaries into sperm-producing testes. Molecular research shows how.
Some lizards such as geckos can self-amputate their tails when threatened - these limbs can keep twitching for up to 30 minutes, creating a distraction and allowing the lizard to escape. Shutterstock

The extreme tactic of self-amputation means survival in the animal kingdom

Why do some animals amputate their own limbs? Turns out, there’s a whole bunch of reasons why this strategy has evolved.

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