Why Rainforest Animals Are Darker: Gloger’s Rule Explained

Rainforest ecosystems are among the most biologically diverse places on Earth, yet one pattern stands out clearly. Many rainforest animals are noticeably darker in colour compared to species living in drier or colder environments. This observation is not random. It is explained by an ecological principle known as Gloger’s Rule , which connects climate conditions to animal pigmentation.

Gloger’s Rule states that animals living in warm and humid environments, such as tropical rainforests, tend to develop darker pigmentation. This is mainly due to higher levels of melanin, the natural pigment responsible for darker skin, feathers, and fur. Melanin in animals provides multiple survival benefits, especially in environments with intense biological activity and moisture.

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