Seasonal changes in the behaviour of animals are usually stimulated by changing critical daylengths.

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Seasonal changes in the behaviour of animals are usually stimulated by changing critical daylengths. This is known as photoperiodism, where organisms measure the length of day and night in order to synchronise their behaviour and physiology with environmental cues. For example, many animals may use day length to time their annual migrations, breeding seasons, or hibernation periods.

Seasonal Changes in the Behaviour of Animals Are Usually Stimulated