The Jarkie is a hybrid dog breed, a mix between a Jack Russell Terrier and a Yorkshire Terrier. These small dogs are known for their energetic and playful nature, with a strong prey drive inherited from their terrier lineage. They possess a wiry or silky coat, often in a mix of black, white, and tan colors, and a keen intelligence that makes them quick learners.

The Jarkie is a fictional species, not recognized in scientific literature or wildlife databases. Therefore, it does not have a native region in the natural world.

As a fictional species, the Jarkie does not exist in any real-world habitat. Hypothetically, one could imagine its habitat based on creative storytelling.

Without real-world data, the ecological niche of the Jarkie cannot be defined. Its role in an ecosystem would be speculative and based on imagination or fictional narratives.