The Bison: from 30 million to 325 (1884) to 500,000 (today)

Photo by Greg Farley, winner of the Flat Creek photo contest. Taken last fall in either TNP or YNP.

Last year, the bison was chosen as America’s first national mammal, joining the bald eagle as a symbol of America. I started writing this post with only a mild interest in bison. But the more I learned, the more I want to learn, and this blog post took on a life of it’s own. The bison have a fascinating history, unique appearance, and they present complex challenges in the present day. They are a symbol of the untamed West. Their near-extinction is a testament to the self-centeredness of “civilized” men and their resurgence shows that we can learn from and try to correct our mistakes.

Why did people nearly push the bison to extinction?

To settle the West, early settlers needed to conquer the Native Americans, and the bison were everything to the Natives. The bison provided meat for food and hides for tepees. So the US Army launched a campaign to kill the bison so they could control the Native Americans. Without this sad and complicated part of our history, many of us would not live in the homes we live in today. We live here at the expense of the people and the animals that used to call this home.


Photo from the 1870s of a pile of American bison skulls waiting to be ground for fertilizer. Wikipedia


A Timeline of the American Bison

1500sAn estimated 30-60 million bison roam North America, mostly on the great plains.
1830Mass destruction of the bison begins.
1860Construction of the railroad accelerates human settlement and killing of bison.
1870An estimated 2 million are killed on southern plains in one year.
1872-1874An average of 5000 bison were killed every day of these three years. That’s 5.4 million bison killed in 3 years.
1884The bison population reaches it’s lowest point. Around 325 wild bison are left in the United States – including 24 in Yellowstone.
1910 Due to conservation efforts, bison increase to 1,000 in the US.
2017Today there are 500,000 bison in the US, including 5,000 in Yellowstone.


This map shows the decline of land occupied by bison.


Now that the bison are no longer endangered, why are the Yellowstone bison special?

Yellowstone is the only place in the continental US where wild, free ranging bison have lived continuously since prehistoric times. It is also the largest bison population in the country. And it’s one of the only purebread (no cattle genes) herds left. The other two other locations with purebred buffalo are in Utah and in South Dakota.

Are all of Yellowstone’s bison descended from the 24 in 1884?

No. In 1902 the U.S. Army brought 21 bison from two private herds to Yellowstone. These animals were bred with those already in Yellowstone.

What challenges do the Yellostone bison still have?

Limited space, and disease. When not facing mass destruction by man, bison are actually pretty good at reproducing; most adult females get pregnant every year. But the Park land is finite and inevitably the bison population wants to spread outside the Park. They do leave, since there is no fence around the exterior of the Park, and cattle ranchers in Montana do not want the bison roaming around and spreading disease to the cattle. The current solution to this problem is for Yellowstone to regularly capture about 1,000 bison per year and ship them to Native American tribes where they are slaughtered.

What disease are the cattle ranchers concerned about?

Up to 60% of Yellowstone bison test positive for brucellosis, which ironically, the bison got from cattle in the early 1900s. Brucellosis has been mostly eliminated from cattle across the US, but persists in the Yellowstone ecosystem’s bison and elk.

Do bison breed with cattle?

Yes (heard of beefalo? Cattalo?) but human intervention is required. Even though bison and cattle are different genus (usually animals need to be same genus to have offspring), they are able to breed and produce offspring that, surprisingly, are fertile (unlike some other hybrids like the mule).  The study of hybrids is a whole different subject.

What is the hump of a bison made out of?

Mostly muscle and bone. The spinous processes and associated muscles of the buffalo are much longer than those of similar mammals. The hump is one reason they are able to survive tough winters. It enables them to use their heads as snowplows in the winter so they can find grass.

Picture from http://www.adfg.alaska.gov/index.cfm?adfg=deltabison.tipsshooting


The bison is a great symbol for America for many reasons. For better or for worse, it’s a history of our determination to settle the West. The resurgence of the bison shows that every once in a while, man does something that is not just for himself.

To the many people who know more about bison than I do: I wrote this post based on information found on the national park website, and the fish and game website. If there are untruths or errors let me know!

Jessica Heath

11 responses to “The Bison: from 30 million to 325 (1884) to 500,000 (today)”

  1. Arsena Mary McIntire says:

    Hope to visit you all someday. It looks so beautiful there. Thank you for the information on Bison. It’s so sad that there are so few left compared to the numbers of the 1500’s. Humans always seem to find ways to destroy nature.

  2. Blake says:

    I am as much of a nature conservationist as the other people who care enough for it like I do. But I’m not sure if those numbers of bison is correct.. in the 1850’s the population in the United States was 23,191,878. And the bison population was 90,000,000 even if every person in the states killed 3.8 million per person that’s just very unrealistic. If if it took 100 years that wouldn’t be accurate. And the 1000 a day times 365 would be 365,000 a year which is doable with population at that time. But 90,000,000 divided by 365,000 that would take 246 years give or take.

    • Al says:

      Are you on drugs? Do the math again. 90 Mil divided by 23 Mil is 3.88 not 3.88 Mil. That’s 4 bisons per person. If only 1% of the population was killing bisons, i.e. 230,000 people, and killed about 100 a year, in less than four years all bison will be gone.

  3. Hello
    We are visiting from Australia and toured Yellowstone. I discovered a guy too late a guy who carved his love for is girlfriend in a tree. I discovered a line protest explaining about the Bison slaughter. I am thinking the brucellosis claim is a cowboy scam. I read in a newspaper about your beautiful Bald Eagle collapsing with lead in their system. Back home a New Zealander in Australia poisoned over 200 of our Wedgetail eagles

    • Art Mills says:

      I’m as much of a nature lover as anyone and probably more so than most. I was a proponent of conservation before it was “woke”. I have been to Yellowstone and it’s beautiful. When I was young, I wanted more than anything to pursue a career in the Forest Service in Montana, but life dictated I follow another career. I am also a realist.

      What information do you have for “thinking the brucellosis claim is a cowboy scam”, or do you think that because it’s what you want to believe? Try to at least be fair with cattle ranchers and do some research before making such a statement.

  4. rhemmy says:

    I heard that there are ‘no more bison’ as they were prior to Native Americans up to the slaughter of them, thus we have they offspring of the bison the buffalo. have fun with this. i like your blog. God bless you.

  5. tk says:

    White man is an idiot. I did a rough calculation on the pile of skulls. 20 feet high 40 feet wide ( average 30 feet ) pretended it was half a sphere and figured each skull took up one cubic foot. I came up with 424,000 skulls. I am not a mathematician, just an average joe, If someone can do a better estimate I would be thrilled to find out.

    • Art Mills says:

      It’s easy to sit at your computer and pass judgment. If you lived there at that time you probably would be doing the same thing.

      While there were professional bison hunters that killed thousands, most people settling the west probably only killed enough to eat and protect their cattle. The American aborigines used to drive whole herds over cliffs when hunting them.

      I wouldn’t be too quick to call them idiots or evil. It shows your own ignorance.

  6. Animal lover says:

    Very sad humans are so evil

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