Appearance: They are small, with many species being cryptically colored (mottled brown, green, etc.) to blend in with their surroundings. They have three dorsal fins and rough-edged scales. Some males have brighter colors than females.
Habitat: Triplefin blennies are reef-dwellers found in tropical and temperate waters of the Atlantic, Pacific, and Indian Oceans. They live on reefs and in other coastal environments.
Behavior: They are territorial and known to defend their space from other blennies. Males may engage in fights using their tails, ramming, and biting to protect their territory.
Diet: Their diet varies by species; some feed on algae and small invertebrates, while others may eat zooplankton.