Rewrite the Evolutionary Textbooks – Again!

Three-spined sticklebacks in the Chehalis River display breeding coloration that differs from other populations. Experiments showed that the black coloration was not necessary for territorial success, weakening the interpretation that had used the behavior to illustrate an evolutionary principle.

Image: Three-spined stickleback 2 Gordon, W. J., CC0, Wikimedia Commons.

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