<p>The <b>Chelodina expansa</b>, commonly known as the Eastern long-necked turtle, is a freshwater species found in eastern Australia, characterized by its long neck, smooth carapace, and a diet primarily consisting of aquatic invertebrates and fish. This turtle plays a crucial role in its ecosystem by maintaining the balance of aquatic populations and is known for its impressive longevity, often exceeding 30 years in the wild.</p>