Atractosteus spatula, commonly known as the Alligator Gar, is a large freshwater fish found in the rivers and lakes of the southeastern United States. It is known for its torpedo-shaped body, elongated snout, and double row of sharp teeth. The Alligator Gar can grow up to 10 feet long and weigh over 300 pounds. It is a predatory fish, feeding on smaller fish, birds, and small mammals. Its ability to breathe both air and water allows it to survive in low-oxygen environments.

Atractosteus spatula, commonly known as the Alligator Gar, is native to the southern United States and parts of northeastern Mexico. Its geographical distribution includes the Mississippi River basin from southwestern Ohio and southern Illinois to the Gulf of Mexico, including the tributaries of the Mississippi River such as the Missouri, Ohio, and Arkansas Rivers. In Mexico, it is found in the Rio Grande and the coastal rivers of the Gulf of Mexico.

The Alligator Gar inhabits slow-moving rivers, lakes, swamps, and bayous. It prefers freshwater environments but can also tolerate brackish water. The species thrives in warm, sluggish waters with abundant vegetation. The water temperature range suitable for the Alligator Gar typically spans from 20°C to 30°C (68°F to 86°F).

The Alligator Gar occupies the ecological niche of a top predator in its aquatic environment. It feeds on a variety of prey, including fish, birds, and small mammals, contributing to the control of prey populations. Its adaptations, such as air-breathing capabilities and a long, torpedo-shaped body, allow it to survive in low-oxygen waters and capture prey efficiently. The Alligator Gar plays an essential role in maintaining the balance of its ecosystem.