Scale discrepancy undermines human overkill theory. Early human populations were small mobile bands, perhaps thousands, not millions sweeping across continents Mammoth populations numbered in the hundreds of thousands across Eurasia and North America Each mammoth required up to 150 kg of vegetation per day
Early human societies were not uniformly tiny compared to the massive megafauna populations they encountered. While some bands were small, emerging research challenges the assumption that all early human groups were small-scale and egalitarian—larger, more complex societies may have coexisted with megafauna. Mammoth populations in the hundreds of thousands and step bison numbering in the millions are plausible estimates, and megafauna like giant ground sloths did reach substantial sizes. The overkill model remains debated, but evidence of sustained, continent-wide mass slaughter for most extinct species is limited.
Key Facts
- Early human populations were small mobile bands, perhaps thousands, not millions sweeping across continents
- Mammoth populations numbered in the hundreds of thousands across Eurasia and North America
- Each mammoth required up to 150 kg of vegetation per day
- Giant ground sloths weighed over 3,000 kg, step bison numbered in the millions
- Kill sites exist but are limited; no evidence of mass slaughter for most extinct species
- Sparse hunter-gatherer groups would need sustained pressure across millions of square kilometers to eliminate continent-spanning megafauna populations
Source: We’re Probably Wrong About the Ice Age Extinction by Michael Button