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Sex-changing dragons blur gender binaries

There are two sexes, right? Male and female. And maybe humans conceive of gender as a spectrum, but other animals are just male or...

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unknownx500

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Birds give more food to smarter offspring

Fairy wren mothers set up an "IQ test" for their babies, and reward good learners with more food. Here's what's even crazier: the IQ test...

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unknownx500

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Culture drives evolution in killer whales

Orcas are the first non-human species to have demonstrable coevolution of genes and culture. What does that mean? The most famous example...

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unknownx500

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