---
title: "knownAnimalIdentifiers(forRevision:)"
framework: vision
role: symbol
role_heading: Type Method
path: "vision/vnrecognizeanimalsrequest/knownanimalidentifiers(forrevision:)"
---

# knownAnimalIdentifiers(forRevision:)

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

## Declaration

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

## Parameters

- `requestRevision`: The revision of the animal recognition request.

## Return Value

Return Value The animal identifiers.

## See Also

### Identifying Animals

- [supportedIdentifiers()](vision/vnrecognizeanimalsrequest/supportedidentifiers().md)
- [VNAnimalIdentifier](vision/vnanimalidentifier.md)