Answer:
an animal may exhibit complex-appearing behaviors when they're actually following simple behavioral rules.
Step-by-step explanation:
Egg-retrieval behavior of Greylag goose just the same behavior of
many ground-nesting birds, is that whenever an egg is been displaced from the nest, the egg will be rolled back to the nest by greylag using its beak. Seen the displaced egg gives a sign of stimulus as well as elicits the egg-retrieval behavior. At first the goose will make it possible to fixates its sight on the egg.Behavioral rules make impossible some specific states which are deemed undesirable or potentially harmful. With Behavioral rules degrees of freedom are removed.
It should be noted that Egg-retrieval behavior in geese exemplifies the principle that an animal may exhibit complex-appearing behaviors when they're actually following simple behavioral rules.