Overview
Sowerby’s Beaked Whale (Mesoplodon bidens), also known as the North Sea Beaked Whale, was the very first beaked whale species ever described by western science in 1804. A master of extreme deep diving, this graceful, spindle-shaped cetacean inhabits the stormy offshore depths of the North Atlantic Ocean, performing breath-holding descents to crushing depths to hunt bioluminescent deep-sea cephalopods.
Biology and Physical Characteristics
Mesoplodon bidens features a slender, torpedo-like hydrodynamic body with a narrow, prominent beak and a gently sloping melon. Adult males develop two prominent, flattened triangular teeth that erupt from the midpoint of the lower jaw and protrude upward outside the closed mouth. The skin is slate-grey to bluish-charcoal on the back, lightening to pale grey beneath, often covered in scratch marks and linear scars from territorial sparring.
Behavior and Ecology
A highly secretive oceanic pelagic species, Sowerby’s Beaked Whale spends the vast majority of its life deep below the surface, executing foraging dives lasting 30 to 60 minutes down to depths exceeding 1,500 meters. Using specialized directional biosonar clicks, it detects and suction-feeds on mesopelagic squids and bottom-dwelling fishes in pitch-black abyssal trenches.
Conservation and Human Impact
Assessed as Least Concern by the IUCN, Sowerby’s Beaked Whale appears naturally insulated from coastal human impacts by its deep oceanic lifestyle. However, like all ziphiids, it is acutely susceptible to military naval sonar exercises, which can trigger decompression sickness and lethal mass strandings, alongside threats from deep-sea plastic ingestion and commercial driftnets.
Interesting Factoid
Adult male Sowerby’s Beaked Whales possess two formidable tusks that erupt from the exact midpoint of their lower jaw, which they use in ritualized underwater jousting bouts, leaving crisscrossing white battle scars across their charcoal flank skin.