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The larger the animal, the less surface area per volume that animal has, making cutaneous repiration not very effective.

It also requires that skin be moist, which can bring about a few other problems, such as not being as effective against bacteria and fungi.

Land animals, which includes mammal, have evolved to lessen the amount of water we loose to the environment. Having a large surface area of moist skin can be mal-adaptive.

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Q: Why is cutaneous respiration impractical for mammals?
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