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Animals that change color with the seasons mainly do so in response to daylight changes, but climate change is causing camouflage problems that may require evolutionary changes.

Human skin's melanocytes respond to light by changing shape, producing pigments and hormones, which may affect sleep patterns.

The document concludes that for hair and feather growth, it's better to target the environment around stem cells than the cells themselves.

The article concludes that better understanding gene regulation related to seasonal changes can offer insights into the mechanisms of seasonal timing in mammals.

Melatonin implants can change the seasonal prolactin levels and hair growth in adult cashmere goats but not in juveniles, and don't delay spring moult for better fiber harvesting.