An organism's response to seasonal change in spring and fall is determined by both critical day length and

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Critical day length refers to the amount of daylight an organism needs in order to trigger a certain biological response, such as migration or reproduction. However, the direction of light (e.g. the angle of the sun) can also have an impact on an organism's behavior. For example, some birds use changes in the angle of light to orient themselves during migration. Temperature, rainfall, and food availability can also impact an organism's behavior and physiology, but they are not directly related to the seasonal changes in daylight that are the focus of this question.

An Organism's Response to Seasonal Change in Spring and Fall