Blennies are small, elongated fish belonging to the family Blenniidae. They are commonly found in shallow coastal waters, often hiding among rocks and coral reefs. Blennies have a distinctive appearance, featuring a flattened body and a large head with prominent eyes. Many species are known for their vibrant colors and patterns, making them popular among aquarium enthusiasts. These fish are primarily herbivorous, feeding on algae and plant matter. Blennies are also known for their unique behavior, often seen darting in and out of crevices. Some species, like the Sailfin Blenny, can even change color to blend in with their surroundings for protection against predators.