The state quarter program was launched in 1999, with five different quarters being issued each year for 10 years.
At first I thought... "why a dead bison?" Here's why (via the US Mint):
The bison skull is a powerful symbol, sacred to many of Montana's American Indian tribes. This symbol can be seen across the State on schools, businesses and license plates, and reflects the rich native tradition of Montana, which was once home to large tribes such as the Crow and the Northern Cheyenne.
Nice design, too.
All coin images in Daniel's Coin Zoo are from my personal collection. I collect, research, and personally photograph every coin displayed on this site. PLEASE do not take my images without permission. If you would like to use any coin image you see, just ask me. Thank you.