Yak Types...
Yaks are divided by color into the following categories: 
- 
Imperial: black hair with a black nose. 
- 
Black: black hair with a gray nose 
- 
Trim: black hair with white trim usually on the forehead, feet and tip of tail. 
- 
Royal: black and white hair (like Holstein cows). 
- 
Golden: light brown to golden color (from a recessive gene). 
- 
Woolly: longer and thicker hair coat.   
Bijou Spun Fingering Weight, 100% Yak Yarn
Bijou Spun Tibetan Dream Sock Yarn
another blog knitter, Julie in Maryland,
 is making 
Color Affection by Veera Valimaki (Ravelry)
with
Yak - Bamboo yarn
in reading about YAKS
i found they are totally used in every aspect
God created a multi-purpose animal 
for us here on earth!
now, where are my 'sticks' & 'string'??!!!
^)^ hawknitr