To keep themselves warm in cold winters is one reason.
I really think that god put fur on animals for two reasons. One to keep them warmed which you already noted, and two to give us something to wear a long time ago!
All mammals have fur, some other animals can have fur e.g the platypus which lays eggs but has fur so it has characteristics of both mammals and reptiles but all mammals have fur.
The answer is yes. All mammals have some hair or fur, even if it's only a small amount in their nostrils like dolphins. Even so called hairless animals such as the Mexican dog and the hairless cat aren't actually hairless.
Placental mammals do not all have fur. Maine mammals such as dolphins, whales and dugong do not have fur.
Most mammals have fur or hair .
All mammals that exist today have some kind of hair or fur. That includes mammals that live in the sea like dolphins and whales.
Fur seals are mammals
Terrestrial placental mammals do have fur or hair. Marine placental mammals do not.
Mammals are different than other animals for a few reasons, but the main one is the presence of hair or fur. Another reason is that mammals have mammary glands.
Mammals have fur.
"Hair" and "fur" are synonyms, and are found on all mammals.
No, wood turtles do not have fur or hair, as they are not mammals.
yes spiders are mammals because they have fur. all mammals have fur that is why.