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=== Other examples of sign stimuli===
More examples of sign stimuli include:
<!-- * The red mark on the mother's beak recognized by [[kelp gull]] chicks. [Wrong. Zippelius et al's experiments with lab-hatched chicks (which initially react to all conspicuous patterns, and eventually to any that will cause them to be fed) prove this to be operant conditioning.] -->
* Light polarization patterns recognized by [[Mayfly|mayflies]] when they are deciding where to drop their eggs.
* The presence of a female [[Centrocercus|sage grouse]] that causes males to exhibit a strut pattern display in order to attract the female during breeding season.<ref>{{Cite journal |last=Haven Wiley |first=R. |date=1973 |title=The Strut Display of Male Sage Grouse: A "Fixed" Action Pattern |journal=Behaviour |volume=47 |issue=1/2 |pages=129–152 |jstor=4533545 |doi=10.1163/156853973X00319}}</ref>
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