It is why life takes "such endless forms most beautiful and wonderful," as British biologist Charles Darwin wrote in his famous 1859 book "On the Origin of Species ... For example, a plant in the ...

Historical records indicate that zebra-donkey hybrids were observed much earlier; Charles Darwin mentioned these hybrid animals in his 1868 book "The Variation of Animals and Plants under ...

Microorganisms—bacteria, viruses and other tiny life forms—may drive biological variation in visible life as much, if not ...

The journal Royal Society Open Science published a survey of 100 researchers of animal behavior, providing a unique view of ...

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