Real love vs. pornography

In the late 1930s, Nikolaas Tinbergen demonstrated a new concept in biology: “supernormal stimulus.” Introducing plaster eggs larger and more brightly colored than ordinary eggs into birds’ nests, he found that birds could be tricked into neglecting their real eggs in favor of the fake ones. Similarly, he used models, larger and more brightly colored than ordinary butterflies, to lure male butterflies away from real females. Animals can’t always tell the difference between a counterfeit and the real thing.

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