Gambusia, commonly known as mosquito fish, are small freshwater fish belonging to the family Poeciliidae. They are native to North America and are often found in ponds, marshes, and slow-moving streams. These fish are known for their ability to consume mosquito larvae, making them popular for natural pest control in aquatic environments. Gambusia typically grow to about 2 to 3 inches in length and have a slender body with a pointed snout. They are livebearers, meaning they give birth to live young rather than laying eggs. Their adaptability to various habitats contributes to their widespread presence in ecosystems across the United States.