Sorex minutus 0.25: Physeter macrocephalus 9,000 grams
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||Haug H. [The macroscopic structure of the cerebrum. Qualitative and quantitative studies on the brain of humans, dolphins and the elephant]. [Article in German] Ergeb Anat Entwicklungsgesch. 1970 43(4):3-70.PubMed ID4928801
||P.138 right column 2nd paragraph: "The differences of the measurements between the various species of mammals are larger than 1,000 times. For example, Sorex minutus has a brain weight of 0.25 gm and Physeter catodon, 9,000 gm (primary source)."