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It may be hard to swallow, but Bumpus could get bumped to the back burner

10,000 Birds

This was proposed as an example of what we now call “stabilizing selection” … variation is constantly introduced into populations, but every now and then “selective forces” culls the variation out. Over the course of 30 years, the researchers collected all the road-killed swallows they encountered while doing their other research.

Killing 189