Is it true that the primary source of wool is sheep?

Sheep are the major source of wool. However, it is not the only source of wool. Other animals like Llamas, Angora goats, Angora rabbits, Cashmere goats, Alpaca, Bactrian camel, etc. are also used to obtain wool. Sheep are herbivorous and reared in the deserts of Australia, Asia, etc. and cold regions of Russia, Europe, etc. So, it is true that the primary source of wool is sheep.