Their fur keeps them warm with a outer coat of coarse guard hairs and a dense, thick undercoat that helps waterproof the animal.
(Their fur; keeps; them) (a dense, thick undercoat; helps; waterproof the animal) Context(a dense , thick undercoat helps,List([70, 105))):(a dense, thick undercoat; helps waterproof; the animal)
a dense , thick undercoat helps,List([70, 105))
Their fur a dense, thick undercoat a dense, thick undercoat
keeps helps helps waterproof
them
waterproof the animal
the animal