Symbiosis is from the Greek for “living together.” A symbiosis is any sort of persistent interaction between two species. Forms of symbiosis include parasitism, which involves a species living off a ...

There are no wild ligers. Indeed, hybrids were once thought to be rare in nature—and of little consequence in an evolutionary sense. But now we know they can play an important role in speciation—the ...

Mutualisms: cooperation between species A model developed by evolutionary mathematicians in Canada and Europe shows that as cooperation becomes easier, it can unexpectedly break down. Watch a ...