Esox masquinongy, commonly known as the musky or muskellunge, is a large freshwater fish native to North America. It is recognized for its elongated body, sharp teeth, and distinctive markings, which can vary from dark green to light brown. Musky are typically found in lakes, rivers, and slow-moving waters, preferring areas with abundant vegetation. This species is known for its aggressive behavior and is a popular target for sport fishing due to its size, which can reach up to 60 inches or more. Esox masquinongy plays an important role in its ecosystem as a top predator, helping to maintain the balance of fish populations in its habitat.