Esox niger, commonly known as the northern pike, is a freshwater fish found primarily in North America. It inhabits lakes, rivers, and marshes, preferring areas with abundant vegetation. The northern pike is recognized for its elongated body, sharp teeth, and distinctive dark green coloration with lighter spots. This species is a popular target for anglers due to its aggressive feeding behavior and size, often reaching lengths of up to 30 inches or more. Northern pike are carnivorous, primarily feeding on smaller fish, and play a significant role in their aquatic ecosystems by helping to control fish populations.