Venom has evolved independently at least four times within eulipotyphlan mammals, more than in all other mammal groups combined.
Notes on verification
Directly supported by peer-reviewed PNAS study (Casewell et al. 2019) with verbatim matching claims in abstract; corroborated by PubMed/PMC mirrors. No contradicting sources found post-2019. [tier=silver indep_score=1.0 clusters=2 claim_tier=notable | kind=empirical eligibility=high (extractor: empirical/medium)]
Sources
- Unravelling the venomous bite of an endangered mammal | ScienceDaily (seed:animals_and_wildlife)
- https://www.pnas.org/doi/10.1073/pnas.1906117116 (corroboration)
- https://pubmed.ncbi.nlm.nih.gov/31772017/ (corroboration)
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6926037/ (corroboration)