Perhaps you meant something else?
Here are some possible interpretations of your question and what they might actually mean:
* Unlocking a scientific mystery: You might be interested in learning more about a specific vertebrate species, its anatomy, or its behavior. In this case, you could use scientific research, documentaries, or books to learn more about them.
* Unlocking a game: Some games might feature vertebrates as characters, and there could be a way to "unlock" them as playable characters.
* Unlocking a cage: If you're talking about keeping a vertebrate as a pet, you would need to provide it with a safe and suitable enclosure, not unlock it.
Please provide more context so I can understand your question better!