Circadian Rhythm

Jordynn Willer

Circadian rhythm is a behavioral cycle that occurs in a daily pattern. They are found in most living things, including animals, plants, and many tiny microbes. Circadian rhythms are physical, mental and behavioral changes that follow a roughly 24-hour cycle, responding primarily to light and darkness in an organism's environment. A circadian rhythm can also be called an internal clock.
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Migration

Birds have several patterns that occur during preparation for migrating. The birds will usually get fatter before they take off, and they will also form into groups to fly together. The internal clock of the bird help them in orientation and navigation.


Photo: https://stinkyspikes.wordpress.com/2009/10/08/do-durian-plants-sleep-at-night/

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Plants

Certain types of plants have a circadian rhythm where they ¨know¨ when it is daytime and night time. The plants will open and close their leaves during a certain time of day, and they will close their leaves at a certain time of night.


Photo: https://stinkyspikes.wordpress.com/2009/10/08/do-durian-plants-sleep-at-night/