a sheep
To protect the animal from their environment. And wool IS that "thick coat of hair" you mentioned.
polar bears
to keep themselves warm
Coat
Many animals have hair that helps to keep them warm. Polar Bears, all other species of bears. Yaks, Highland cattle, are just 4 examples of animals that have thick, long hair.
TIPSY cake
They have a thick coat so they can live in the freezing temperatures of Russia.
Different animals have different ways of surviving the Antarctic weather. For some it might be their thick coat of fur or simply huddling together in a group.
The opposite of a thick coat is a thin coat. While a thick coat provides warmth and insulation, a thin coat offers lighter coverage and is more suitable for mild weather. Additionally, a thin coat may be made of lighter materials, allowing for greater breathability and comfort in warmer conditions.
A blobber is another term for a blubber, a fatty layer of adipose tissue or thick coat of fat worn by many arctic animals.
On some days boy evacuees wear caps or woolen hats, and their knee-length trousers, well girl evacuees would wear berets, a headscarf/or a woolen hat, and a knee-length dress/ or skirt. They would also wear shoes/boots/ or wellies, a woolen jumper/or a cardigan, and a shirt (usually collard)/ or a blouse. Also on cold/ or wet days, they wear a warm/or waterproof coat, and if it is very cold they wear a scarf, gloves, and thick socks.
Rubber cement can dry in 15 minutes if it is not a very thick coat. If it is a thick coat, it will take longer.