Polypteridae, commonly known as bichirs, are a family of freshwater fish found primarily in Africa. They are characterized by their elongated bodies, multiple dorsal finlets, and unique lungs that allow them to breathe air. Bichirs inhabit various environments, including rivers, swamps, and lakes, and are known for their ability to thrive in low-oxygen waters. These fish are ancient, with a lineage dating back over 400 million years, making them one of the oldest living fish families. Bichirs are carnivorous and primarily feed on small fish and invertebrates. Their distinctive appearance and fascinating behaviors make them popular in the aquarium trade.