What other adaptation could have koalas as they evolved from land dwellers to tree dwellers?

Another adaptation that could help koalas is the similarity of their coat color to the color of the trunk of the trees they live on, usually eucalyptus.

Explanation:

In the Animal Kingdom, all animals can be prey for another in the constant struggle for survival. Therefore, animals that have characteristics that reduce predation survive and pass this characteristic on to their descendants.

One of the adaptations that favor survival and decrease predation is camouflage. This happens when an organism is very similar to the environment in which it lives, making it difficult to locate. This similarity can be due to the color and even the shape of your body and its texture.

In the case of koalas, camouflage is an adaptation that favored the survival of koalas as they evolved from land dwellers to tree dwellers, because the koalas' coat resembles the color of the trunk of the trees they live on, which makes predators difficult to see.

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that is wrong, its not thymus.