Joe Rogan Experience #2541 - Thomas Campbell · Aired Aug 18, 2026
Claim summary · not a verbatim quotation
Dolphins have brains that are 40% larger than human brains.
The finding
What the evidence shows
Dolphin brains are bigger, just not by that much. A bottlenose dolphin brain runs about 1,500 to 1,700 grams against roughly 1,300 to 1,400 for a human, so somewhere between 15 and 25% heavier rather than 40%. Measured against body size, which is the comparison that tracks intelligence better, humans come out well ahead.
Read the supporting source · pmc.ncbi.nlm.nih.gov ↗Quick answer & review status
Quick answer
Is it true that Dolphins have brains that are 40% larger than human brains?
Partly. The claim stretches what the evidence shows. Dolphin brains are bigger, just not by that much. A bottlenose dolphin brain runs about 1,500 to 1,700 grams against roughly 1,300 to 1,400 for a human, so somewhere between 15 and 25% heavier rather than 40%. Joe Rogan said it (matched by voice) on Joe Rogan Experience #2541 - Thomas Campbell, aired Aug 18, 2026, at 26:09. The supporting source is pmc.ncbi.nlm.nih.gov, linked below.
The context belongs here.
No separately verified on-air correction is recorded for this check. That is not a claim that nobody corrected it.
- Attribution
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- Editorial context review
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- Coverage
- One selected claim from the episode
Revisions to this check
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