“The claws of death” portrays an overpowering seizure, while “the mounts of youth” depicts the passage of youth as the end of a journey. In both, however, the target is stated and is equipped with something belonging to a different conceptual scene.
Claws become meaningful through a predator image; the mounts of youth through a journey or travel image. An associated attribute serves as a key to the fuller metaphorical construction.
The examples should still be analyzed individually. Their precise classification depends on wording, attribution, context, and original lexical meaning; merely encountering an animal-related word does not settle the type of metaphor.