Amia calva, commonly known as the bowfin, is a predatory fish found in sluggish, freshwater environments like swamps and lakes across North America. This ancient species, often referred to as a 'living fossil', has a long, cylindrical body, sharp teeth, and a unique respiratory system allowing it to breathe air. The bowfin plays a crucial role in controlling fish populations and maintaining the balance of its aquatic ecosystem.

Amia calva, commonly known as the bowfin, is native to North America. Its geographical distribution includes the eastern United States and parts of southern Canada. The bowfin is predominantly found in the Mississippi River basin, the Great Lakes, as well as the St. Lawrence River drainage. It is also present in the Gulf Coast drainages from Texas to Florida.

The bowfin inhabits freshwater environments, typically preferring slow-moving or stagnant waters. It is commonly found in swamps, backwaters, lakes, and rivers with abundant vegetation. The species thrives in warm, shallow waters with a muddy or vegetative substrate, which provides ample cover and feeding opportunities.

Amia calva is a predator in its ecological niche, feeding on a variety of smaller fish, amphibians, and invertebrates. It plays an important role in controlling the population of these organisms in its habitat. The bowfin's ability to breathe air through its swim bladder allows it to survive in low-oxygen environments, giving it a competitive advantage in habitats where other fish may struggle.