Biological sex in nature is far from simple – and the animal queendom proves it.

From fish that change sex, to intersex whales, to species that reproduce without males at all, this episode dives into the wonderfully non-binary reality of animal anatomy and reproduction. Some animals are born one sex and become another. Some respond to temperature, social structures, or hormones. Others simply opt out of sex altogether.

Dr Cat is joined by Zoe Walder from Museums Victoria to explore how sex, anatomy and reproduction work across the animal kingdom – and why human ideas about “male” and “female” don’t always fit the science. This episode celebrates the diversity, flexibility and fabulousness of life on Earth. Because in nature, binaries are optional – and the queendom always reigns.

Originally aired 3rd February, 2026.

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