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Birds absorb less or more water in their digestive system

As compared to mammals do birds absorb less or more water in their digestive system? Why is this phenomenon an adjustment to flight?

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Bird feces are more liquid than the mammal feces, that is, less water is absorbed in the avian digestive system. The additional frequent removal of feces in birds due to their less solid feces is an adaptation to flight as their body weight is kept lower.

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