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In the case of the Savannah sparrow, such outbreeding reduced adaptation to the environment.

"It's actually quite a hard thing to demonstrate the effects of outbreeding," Bowie emphasized.

"Having access to the historical series of the museum specimens from before saltmarshes were transformed in the bay to compare with modern birds helps you make the case that outbreeding depression is having a significant effect on the populations. The genetic diversity looks great, but it's masking an outbreeding depression effect."

Thanks to this and other conservation efforts like those at the Oakland Zoo's outbreeding program and the Department of the Interior's Bison Working Group, the North American population is slowly rebounding.

In other words, yes, we should worry about nuclear war and runaway climate change, but we should worry just as much about, to put it bluntly, less intelligent or less capable people outbreeding the smartest people.