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TBF at average 3m length, 13.3M would give approx 40million metres, so their assertion is correct
20-30 million bison is indeed 'more than enough', provided of course one assumes the average 3m length is correct and takes account of the proportion of adult Vs juvenile bison. In any case, you'd need a massively disproportionate percentage of very young bison for 20 million not to give sufficient leeway for any demographic skewing of the average length though.
to the right level of detail in their analysis.
considering the average length of a bison is about 3 meters, and the length of the equator is about 40 million meters, then something something maths. I failed.
20-30 million bison are enough to circle the equator if laid nose to tail.
In the early 1700s, North America was home to an estimated 20 million to 30 million bison, more than enough to circle the equator if laid nose to tail. https://www.sierraclub.org/sierra/2021-2-summer/feature/bison-and-blackfeet
If I'd had to guess I'd have been surprised if they'd spanned the United States.