According to researcher Felisa Smith of the University of New Mexico, large herbivores release 80–90% of their methane through burps rather than flatulence.
Notes on verification
Direct quote from Felisa Smith confirmed in National Geographic article and independently corroborated by Everything Dinosaur blog covering the same 2010 Nature Geoscience study; UNM press release confirms her role and methodology, consistent with general scientific understanding of ruminant methane emission via eructation. [tier=silver indep_score=0.875 clusters=2 claim_tier=notable]
Sources
- Mammoth-Belch Deficit Caused Prehistoric Cooling? (seed:history_and_archaeology)
- https://blog.everythingdinosaur.com/blog/_archives/2010/06/05/4545196.html (corroboration)
- https://news.unm.edu/news/390 (corroboration)