Ring, transponder, DNA: what each identifier actually proves
Three identifiers, three very different levels of proof. Only one holds up in court, and it is not the one the market looks at most.
The market treats these three identifiers as if they were equivalent. They are not equivalent at all.
The closed ring
A closed ring is fitted to the young bird in the nest, at an age when it can no longer be removed without being cut. It is the historic standard of proof of captive breeding.
Its limitation is known to anyone who commits fraud: a ring can be reused. A wild bird captured young can be ringed. A ring recovered from a dead bird can be refitted. The ring proves that a ring was fitted, not on which bird.
The transponder
An injected chip, readable with a scanner. It identifies an individual in a way that is harder to transfer than a ring, and above all it allows an on-the-spot check, in a few seconds, that the bird in front of you is indeed the one in the file.
Its limitation: it links a number to a body, not a body to an origin. And a mismatch between the chip number, the ring number and the permit references is enough to block a file at inspection.
The DNA parentage test
A panel of STR markers compares the bird's genetic profile to that of its declared parents. It is the only one of the three identifiers that is admissible in court, and it has already served as the basis for convictions.
Its limitation must be stated clearly, including by those who sell it: DNA does not prove captivity. It does not say "born in captivity," it says "descended from these parents." A wild bird for which real wild parents were falsely declared would pass the test.
What it does do, however, is make the lie detectable. During Operation Tantallon, British police confirmed by DNA that fifteen peregrines declared as captive-bred were in fact wild birds, because their profile did not match the declared parents. That is the entire value of the test: it does not establish innocence, it breaks the most common form of documentary fraud.
In practice
| Identifier | Proves | Does not prove |
|---|---|---|
| Closed ring | That a ring was fitted young | On which bird |
| Transponder | That this individual carries this number | Its origin |
| DNA parentage | Compatibility with the declared parents | Place of birth |
Combining all three, documented from hatching and kept in a registry, is worth infinitely more than each taken on its own.
Sources
- CITES, Res. Conf. 12.10 (Rev. CoP15) on the registration of breeding operations
- Operation Tantallon, British police: fifteen wild peregrines confirmed by DNA among birds declared as captive-bred