How Do Reindeer Function Without Sunlight? - De-Natured

The video explores endogenous biological rhythms, focusing on circadian rhythms in polar regions. It discusses a study on Svalbard reindeer, examining how these rhythms persist despite extreme environmental conditions. The research measured variables like heart rate and temperature, finding that circadian rhythms exist year-round, influenced by light and vegetation. The study's implications are significant for understanding biological rhythms and climate change effects. Critiques include small sample size and differing results from past studies, highlighting the need for further research.

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