This was defined as an innate releasing mechanism (IRM). The goose's IRM when put to the test in the natural world not being manipulated by scientific experimentation is almost always efficient in getting the desired item of an egg back into the nest.

Other examples of sign stimuli

More examples of sign stimuli include:
* The red mark on an adult's beak recognized by the chicks of various gull species.
* Light polarization patterns recognized

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