Final answer:
A fixed action pattern is an innate behavior that continues to completion once initiated, regardless of whether the initial stimulus is removed.
Step-by-step explanation:
A fixed action pattern is an innate behavior that is initiated by a specific stimulus and once initiated, the behavior will almost always continue to completion even when the stimulus is removed during the behavior. Fixed action patterns are prevalent throughout the animal kingdom and are important as they ensure that certain critical behaviors are executed reliably.
Examples of such behaviors can be seen in a variety of species, from the complex nest-building of birds to the aggressive responses of male sticklebacks during breeding season when they see the color red.
Innate behaviors, or instincts, are crucial for the survival and reproduction of animals. They do not require learning or practice and are genetically programmed within an organism. These behaviors usually involve essential life functions such as feeding, mating, and caring for offspring. For example, birds migrate without being taught, and infants suckle reflexively for nourishment.