Simplify the following text for a Grade 7 native English-speaking person.
Original: The skin of salamanders secretes mucus , which helps keep the animal moist when on dry land , and maintains their salt balance while in water , as well as providing a lubricant during swimming .
Simplified: The skin of salamanders secretes mucus . This helps to keep the animal moist when on dry land , and maintains their salt balance while in water , as well as providing a lubricant during swimming .