<!--
{
  "availability" : [
    "iOS: 13.0.0 - 15.0.0",
    "iPadOS: 13.0.0 - 15.0.0",
    "macCatalyst: 13.1.0 - 15.0.0",
    "macOS: 10.15.0 - 12.0.0",
    "tvOS: 13.0.0 - 15.0.0",
    "visionOS: 1.0.0 - 1.0.0"
  ],
  "documentType" : "symbol",
  "framework" : "Vision",
  "identifier" : "/documentation/Vision/VNRecognizeAnimalsRequest/knownAnimalIdentifiers(forRevision:)",
  "metadataVersion" : "0.1.0",
  "role" : "Type Method",
  "symbol" : {
    "kind" : "Type Method",
    "modules" : [
      "Vision"
    ],
    "preciseIdentifier" : "c:objc(cs)VNRecognizeAnimalsRequest(cm)knownAnimalIdentifiersForRevision:error:"
  },
  "title" : "knownAnimalIdentifiers(forRevision:)"
}
-->

# knownAnimalIdentifiers(forRevision:)

Returns a list of animal identifiers the recognition algorithm supports for the specified revision.

```
class func knownAnimalIdentifiers(forRevision requestRevision: Int) throws -> [VNAnimalIdentifier]
```

## Parameters

`requestRevision`

The revision of the animal recognition request.

## Return Value

The animal identifiers.

## Discussion

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)