Sheep, camel, bison, llamas produce wool. their wool is elastic. But all animals doesn't produces the same type of wool. there will be differences when we see the wool that was produces by different type of animals. the wool of sheep,bison etc are normal. but when we went the wool of the llama type animals, we can find a little lanolin in their wool. some people will get ellergy when they wore the wool of sheep. in that case, they can use the llamas wool which can be convinient to them.