The chin-tucking movements used by the female greylag goose as she rolls the egg back to the nest are a fixed action pattern. If the egg is removed or replaced with another object, the female will continue the action. The video shows this fixed action pattern.
This is an example of a circadian clock that determines when a butterfly will emerge from its chrysalis. Even when it is dark, the butterfly will emerge whenever morning would have been. The clock also dictates when the fall migration begins, by keeping track of day length.
This video shows the complex albatross courtship ritual. To reaffirm and reinforce the bond between them, albatrosses initiate and react to movements initiated or made by its partner. The birds spend much time performing synchronized dances, bill clapping, and sky pointing. This dance helps determine if the two birds are compatible with each other.
Ruby-throated Hummingbirds migrate between southern Mexico and northern Panama. Hummingbirds lead solitary lives and neither live nor migrate in flocks. Ruby-throats begin moving north as early as January. Before departing, each bird doubles its weight in preparation for the grueling journey which is spread over a three-month period.