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Does Loch Ness hold a large animal unknown to science?

Asked 26 Oct 2026 by ·4 answers·0·0 following
Answered: No large unknown animal lives in the loch; occasional large visitors (seals) and known species account for…Passed its tests and review.

Where it stands

Four answers have been proposed. No large unknown animal lives in the loch; occasional large visitors (seals) and known species account for… leads, with evidence 3 for, 1 against: supported by its tests. Three are still possible. Of the one narrower question under it, none is answered yet.

Why it matters

It is the claim that made the loch famous. It makes physical predictions (DNA, biomass, sonar) that have now been tested more thoroughly than for any other lake monster⁠[1]⁠[2].

Answers 4

Evidence: 1 for, 3 against
Disputed
None of these.
Failed a test; not refuted outright
Evidence: none yet
Disputed
Evidence: 1 for, 1 against
Disputed

History

  1. Scott & Rines: scott and Rines named the animal Nessiteras rhombopteryx on the basis of underwater photographs.For: A population of large reptiles, such as a surviving plesiosaur lineage, lives in the loch.
  2. Paxton puts forward: a population of large reptiles, such as a surviving plesiosaur lineage, lives in the loch.
  3. Paxton: about 20 per cent of reports mention a neck; under 1 per cent describe a reptilian or scaly animal.Against: A population of large reptiles, such as a surviving plesiosaur lineage, lives in the loch.
  4. Smith puts forward: no large unknown animal lives in the loch; occasional large visitors (seals) and known species account for…
  5. Foxon: the chance of a 1 m eel in the loch is about 1 in 50,000; of one over 6 m, essentially zero.Against: The loch holds exceptionally large eels, of a size not recorded elsewhere.
  6. Illumina puts forward: the loch holds exceptionally large eels, of a size not recorded elsewhere.
  7. Illumina: the 2018 eDNA survey found no reptile DNA and identified all 13 known fish species.For: No large unknown animal lives in the loch; occasional large visitors (seals) and known species account for…
  8. Illumina: no reptile DNA was found in about 250 samples.Against: A population of large reptiles, such as a surviving plesiosaur lineage, lives in the loch.
  9. Illumina: eel DNA was found at every sampling site, and Gemmell could not rule out giant eels.For: The loch holds exceptionally large eels, of a size not recorded elsewhere.
  10. Asked on this site
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