The initial AI verdict was softened after source quality and evidence strength were reviewed.
Verdict TRUE

TRUE — Octopuses have three hearts and blue blood. When they swim, their main heart stops beating, which is why they prefer to crawl

Verified on September 25, 2026

Available sources provide limited support.

Confidence62%

How strongly independent, cited sources support this verdict.

Analysis summary

Available sources provide limited support. Review the cited sources before relying on this conclusion.

Evidence profile

49 / 100 weighted evidence score H:1 / M:0 / L:1

Key findings

  • Available sources provide limited support.

Sources

Analyzed across 2 independent publishers

Ten Wild Facts About Octopuses: They Have Three Hearts ... Smithsonianmag
High credibility 74/100
institutional_primaryKnown reference source
Eight Strange and Wonderful Facts About Octopuses Sheddaquarium
Low credibility 24/100
unknown_low_authorityStandard web source

Citations

Copy formatted citations from the verified sources above.

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