Overview
The Atlantic Humpback Dolphin (Sousa teuszii) is widely recognized as one of the rarest, most imperiled coastal cetaceans on planet Earth. Endemic strictly to the narrow inshore coastal corridor of tropical West Africa, this secretive marine mammal inhabits shallow mangrove estuaries, tidal river deltas, and surf zones rarely exceeding 20 meters in depth. Characterized by its slate-gray coloration, slender beak, and a distinctive fatty dorsal hump supporting a small hooked fin, the species faces an acute crisis of survival with fewer than 1,500 mature individuals remaining in the wild.
Biology and Physical Characteristics
Sousa teuszii exhibits a sturdy, hydrodynamic body featuring a uniform leaden to brownish-gray coloration that lightens slightly across the abdomen. Its most distinctive anatomical hallmark is an elongate, fatty hump positioned along the middle of its back, atop which sits a small, falcate dorsal fin. It possesses a well-demarcated, slender rostrum and broad, paddle-shaped pectoral flippers that facilitate precise navigation through turbid, tide-swept mangrove channels and shifting sandbank shoals.
Behavior and Ecology
Living in small, tight-knit pods of two to ten individuals, Atlantic Humpback Dolphins are slow, deliberate swimmers that rarely perform aerial acrobatics, surfacing unobtrusively with only the snout and dorsal hump breaking the waves. They forage in extreme shallows—often within a few hundred feet of the beach or deep inside mangrove networks—corralling schools of coastal fish, particularly mullets (Mugilidae) and croakers (Sciaenidae). In certain locations, such as Banc d’Arguin in Mauritania, they engage in legendary cooperative foraging with traditional Imraguen fishermen, driving fish schools toward beach casting nets.
Conservation and Human Impact
Evaluated as Critically Endangered by the IUCN and listed on Appendix I of CITES, the Atlantic Humpback Dolphin is on the brink of extinction. Because it lives exclusively within shallow, nearshore waters, it suffers catastrophic mortality from entanglement in artisanal gillnets and shark nets. Furthermore, port development, mangrove clearing, and noise pollution from coastal construction sever its fragmented home ranges. International cetacean consortia and West African marine agencies are rushing to establish protected coastal sanctuaries and implement dolphin-safe fishing gear to save this noble creature.
Interesting Factoid
In Mauritania, these rare coastal dolphins have formed a famous partnership with traditional beach fishermen for generations, deliberately driving dense schools of mullet right into the fishermen’s throw-nets in exchange for an easy feast!
Last updated: October 2026