* Sex: Male bison (bulls) are significantly larger than females (cows).
* Age: Bison continue to grow throughout their lives, with older animals being heavier.
* Geographic location: Bison populations in different areas may have different average weights due to factors like climate and available food sources.
Here's a general range of weights for bison:
* Bulls: 1,000-2,000 pounds (450-900 kg)
* Cows: 800-1,200 pounds (360-540 kg)
Some additional information:
* The heaviest bison on record weighed over 2,500 pounds (1,130 kg).
* Bison calves weigh around 30-40 pounds (14-18 kg) at birth.
It's important to note that these are just estimates. Individual bison can fall outside of these weight ranges.