The Deposition and the DNA: What Happens When You Actually Test the Evidence

There is a document in the Scottish Archives dated October 29, 1811, that deserves more careful attention than it usually receives in cryptozoological circles — not because it proves anything about mermaids, but because of what it is.

It is a sworn legal deposition. John McIsaac, twenty-three years old, tenant's son from Corphine on the east coast of Kintyre, appeared before Duncan Campbell, Sheriff Substitute, and gave testimony under oath about something he had seen four miles south of Campbeltown sixteen days earlier. He described crawling on all fours through a field of corn to get closer without being seen. He described the creature's coloring — white upper half, brindled reddish-grey lower half, scales, a greenish-red tail. He described watching it stroke its own hair back from its face when the wind came off the land.

The document is not a newspaper account. It is not a campfire story written down decades later. It is a legal instrument, produced under the same procedural conditions as any other sworn testimony of the period, signed by the sheriff. Whatever McIsaac saw, he was willing to say so in a formal legal context, with his name attached.

This is the part of cryptozoological evidence that tends to get lost in the argument between believers and debunkers. The believer says: look at all these reports. The debunker says: show me the body. Both are right. Neither is asking the more interesting question, which is: what exactly is this category of evidence, and what can it actually tell us?

The 2014 Sykes study gives us one answer. Bryan Sykes and his colleagues at Oxford ran rigorous genetic analysis on thirty hair samples attributed to anomalous primates — yeti, Bigfoot, and others. The methodology was serious: decontamination, mitochondrial sequencing, published in a peer-reviewed journal. The results were, depending on your perspective, either deflating or fascinating. Most samples came back as known mammals. Two Himalayan samples — one from Ladakh, one from Bhutan — matched most closely with a Palaeolithic polar bear, Ursus maritimus, a lineage not previously known to exist in the region.

The debunker's headline writes itself: DNA proves yeti is a bear. But sit with the Sykes result for a moment. What it actually shows is that something in the Himalayas was leaving hair that matched a bear species with no confirmed current population there, related to a Pleistocene lineage. The subsequent 2017 work on Tibetan Plateau bear evolutionary history complicated this further, finding that Himalayan bear populations form a well-supported sister lineage to all other extant bear clades — a genuinely enigmatic evolutionary picture in a region where large mammals are still being formally described.

The DNA evidence doesn't kill the mystery. It relocates it.

This is the pattern I find genuinely interesting across the cryptid literature: the evidence, when it gets tested at all, tends to produce results that are strange in different ways than expected. The 1734 Egede sea serpent account from Greenland — analyzed seriously by Charles Paxton in 2005 — turns out to be compatible with known cetacean behavior, specifically the way large baleen whales can produce serpentine visual effects when their bodies and flukes appear at the surface at different times. The creature Egede saw was almost certainly a whale. But the specific visual phenomenon he described, the apparent serpentine motion, is a real perceptual effect produced by a real animal in a real way. The misidentification is informative.

McIsaac's mermaid almost certainly was not a mermaid. The forensic literature on seal behavior, particularly female grey seals hauled out on rocks, is suggestive. Seals do use their flippers in ways that can read, at distance, as hands. Their vocalizations are strange. Their eyes are large and forward-facing. A twenty-three-year-old farmer who had probably never seen a seal up close, watching something unfamiliar through the Kintyre wind, is not an unreliable witness so much as a witness using the only interpretive framework available to him.

But here is the thing: he crawled through a cornfield to get close. He got within twelve to fifteen paces. He observed for long enough to watch the creature adjust its hair multiple times. Whatever he saw, he saw it carefully.

The folklore studies literature makes a related point from a different direction. The biogeographical analysis of trickster animal distributions across cultures — published this year — finds that the distribution of trickster animals in folklore isn't random and isn't universal. It tracks real animal distributions in ways that suggest folklore is, at least in part, encoding genuine zoological observation, even when that observation has been transformed through narrative into something unrecognizable.

Monsters, in other words, leave traces. Not the traces we expect, not the bodies or the clear photographs, but traces of real encounters with real phenomena — misidentified, amplified, narratively transformed — embedded in legal depositions and folklore databases and DNA results that match extinct lineages.

The 1877 newspaper account from the Pine Barrens describes workers on the river front arguing about whether they'd seen a sea serpent, an alligator, or the devil. Some said forty feet. Some said sixty. The diversity of interpretation is the point. Multiple people saw the same thing and produced radically different accounts of it. This is not a failure of evidence. This is evidence of something.

I don't know what John McIsaac saw on that rock in Kintyre on October 13, 1811. I don't think he did either, exactly — which is why he went to the sheriff. He was trying to establish, through the best evidentiary mechanism available to him, that something real had happened.

That impulse — the desire to get the strange thing into the record, to make it official, to submit it to scrutiny — is not credulity. It is the opposite of credulity. It is the same impulse that drives the Sykes study, the Paxton analysis, the bear phylogenetics. The question is the same across two centuries: what was that, actually?

We keep not quite answering it. But the attempts accumulate, and they are not nothing.