Usually one, much the same as you have one layer of hair on your head, if you have hair on your head.
3 layers
2
2
2
2 of kind
Beginning in the 1790s, and especially during the 19th century, fur seals were hunted because their fur was so valuable. A select few species suffered dramatic declines, but are now recovering. Most species are now protected and hunting is mostly limited to subsistence harvest (for Native Americans and Eskimos).
Most dog breeds don't have two layers, or a double coat, of fur. 82 out of 180 breeds have a double coat of fur. According to exactly how many dogs, not dog breeds, have two layers of fur, I would not know.
3-4
None. Eagles have feathers.
Quil's fur is black when he is in wolf form.
It was endangered because of many people hunting the wolf for food or fur or their teeth!
The fur of seals has two layers. The first layer is the closest to the body that are short, fine and very warm. The second layer are the longer fur called "guard hair' which is a waterproof layer.
yes.