PubMed · 2026-02-17
Scientists analyzed the gut bacteria of 14 marsupial species to understand why kangaroos and wallabies produce less methane than cattle when eating similar plant-based diets. They found that marsupials use a variety of microbial strategies to process hydrogen — a byproduct of plant digestion — and that methane output likely varies significantly between individual animals, not just between species.
Analysis of 33 fecal samples from 14 marsupial species yielded 1,394 reconstructed microbial genomes, providing the first systematic map of methane-related genes across marsupial gut microbiomes.
Some marsupials showed enrichment of methanogenesis genes (mcrA and methanogen-specific hydrogenases), while others were enriched in bacterial hydrogen-uptake genes and alternative pathways such as nitrate/nitrite and sulfite reduction.
Hydrogen management strategies varied both between and within marsupial families and gut types, indicating that methane emission potential may differ at the level of the individual animal, not just the species.