The purpose of the mucus found within the respiratory system is to

The mucus membranes. These are thin membranes that form a protective lining inside many organs and parts of the body such as the trachea. Mucus produced by these membranes trap bacteria and harmful particles which are then expelled from the body.

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Used to water and cool climates, probably not thick coated or fluffy. they most likely have thin coats and have to survive to find food. sorry if this wasn't the answer you were looking for..: )