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Another example of a behavior that has been described as a fixed action pattern is the egg-retrieval behavior of the [[greylag goose]], reported in classic studies by Niko Tinbergen and Konrad Lorenz.<ref name=":92"/> Like many ground-nesting birds, if an [[Egg (biology)|egg]] becomes displaced from the nest, the greylag rolls it back to the nest with its beak.<ref name=":92"/><ref name=":0" /><ref>{{Cite web|url=http://www.pigeon.psy.tufts.edu/psych26/fap.htm|title=Fixed Action Pattern - Greylag Goose|website=pigeon.psy.tufts.edu|access-date=December 11, 2018}}</ref> The sight of the displaced egg is the sign stimulus and elicits the egg-retrieval behavior.<ref name=":92"/> First, the goose fixates its sight on the egg.<ref name=":92"/> Next, it extends its neck over the egg.<ref name=":92"/> Finally, it rolls the egg back to the nest using the underside of its beak.<ref name=":92"/> If the egg is removed from the goose during the performance of egg-rolling, the bird will continue with the behavior, pulling its head back as if an imaginary egg is still being maneuvered.<ref name=":92"/> It has been shown that the greylag will also attempt to retrieve other egg-shaped objects, such as a golf ball, door knob, or even a model egg too large to have possibly been laid by the goose itself (i.e. a supernormal stimulus).<ref>Tinbergen, N. (1951). ''The Study of Instinct''. Oxford University Press, New York.</ref>
The sight of the egg outside of the nest serves as the stimulus in this particular instance because it is only after the recognition of the eggs displacement that the Fixed Action Pattern occurs.<ref name=":0" /><ref name=":1">{{cite web |last1=OpenStax College Biology |title=Behavioral Biology: Proximate and Ultimate Causes of Behavior |url=https://cnx.org/contents/GFy_h8cu@10.53:rZudN6XP@2/Introduction |website=cnx.org |accessdate=20 November 2018}}</ref>
The manipulation of the sign stimulus through a series of experiments can allow scientists to understand what specific component of the stimulus is responsible the innate behavioral sequence. If the egg were to be picked up and taken away after it is displaced from the nest, the goose still exhibits the same head moving motion even though there is no egg present.<ref name=":0" /> This was put to the test by using objects such as beer cans, and baseballs. Experimenters found that the stimulus merely had to be an object that was large enough in size, convex enough in shape, and comfortable enough for the goose to lay its neck around the edges of the object.<ref name=":0" />
These features that the stimulus has to obtain in order to trigger a resulting FAP were then given the official term of Sign Stimuli. Scientists came to the realization that there must be an innate deciphering method that the goose goes through in order to determine a suitable sign stimulus. This was defined as an [[
=== Other examples of sign stimuli===
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