How does e.g rabbits change their fur? And how does it trigger? Like how do they know when to change or do they?
In: Biology
They shed their old fur and grow new fur of a different color. Obviously not all at once like a lizard shedding its skin, but over time, hairs naturally fall out and the replacement hairs come in with a different color.
This change is triggered by hormonal changes, usually in response to a particular set of environmental changes. Temperature, food quantities, light exposure, etc. can signal the difference between summer and winter, and can trigger the change within the animal. (We humans don’t change color, but we have similar triggers; for example, specific times and locations can make us feel hungry and bright lights can keep us awake since both sleep and hunger are regulated by hormones.)
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