In music, the hair of which animal is usually used to make a bow?

Player #40866476, The horse lives to run and play oblivious that he'll soon bre making music.

Horsehair used in violin bows comes from the tails of horses raised in specific cold climates like Mongolia, Siberia, or Canada. The thicker the hair, the better the sound.

would have thought in this day and age they would have found a non-animal alternative

Player #40257368, Doesn't make any sense

Player #40866476, it got a haircut

I have a bow of plastic fiber I guess