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37
Mostly False Earth

The male octopus leaves its sexual organ in the female and grows a new one. Old fishermen are sometimes found in females.

The claim that male octopuses leave their sexual organ in the body of females is supported by evidence indicating certain species detach their mating arm, the hectocotylus, which is left in the female. However, there is no evidence that males regrow this arm as a 'new sexual organ.' They can regenerate arms generally, but this process is not akin to regrowth of a sexual organ after mating. For the claim of fishermen found in female octopuses, evidence suggests there's no basis in reality. This appears to be a misinterpretation or urban legend rather than factual biological behavior.

June 08, 2026 Language: en 3 claims analyzed

Individual Claims

74
Mostly True Biology
The male octopus leaves his sexual organ in the body of the female.
The male octopus uses a specialized arm known as the hectocotylus to transfer sperm to the female, and in some species, this arm detaches and remains inside the female. This behavior is noted in scientific observations.
Fact Check Score None
Fact Check Weight 0
Web Consensus Score 75
Web Consensus Weight 50
Source Quality Score 80
Source Quality Weight 25
Llm Reasoning Score 80
Llm Reasoning Weight 25
Weighted Total 74
Evidence Summary 2 web sources confirm male detachment of mating organ.
28
Mostly False Biology
The male octopus grows a new sexual organ after mating.
While octopuses can regrow arms, there is no evidence that they regrow a new sexual organ after mating, akin to regrowing a functional hectocotylus for mating again, as the regrowth is general arm regeneration, not specific to sexual reproduction.
Fact Check Score None
Fact Check Weight 0
Web Consensus Score 20
Web Consensus Weight 50
Source Quality Score 20
Source Quality Weight 25
Llm Reasoning Score 25
Llm Reasoning Weight 25
Weighted Total 28
Evidence Summary 1 web source detail arm regeneration, not sexual organ regrowth.
10
False Biology
Old fishermen are sometimes found in the bodies of female octopuses.
This claim appears to be a humorous or fictional tale rather than fact. No sources provide evidence to support it as a biological occurrence.
Fact Check Score None
Fact Check Weight 0
Web Consensus Score 0
Web Consensus Weight 50
Source Quality Score 0
Source Quality Weight 25
Llm Reasoning Score 5
Llm Reasoning Weight 25
Weighted Total 10
Evidence Summary No evidence found related to claim about fishermen.

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