Mammals
Rough-Toothed Dolphin
Steno bredanensis · also called rough-toothed dolphins
Slicing through deep tropical water alongside a group of pilot whales, a rough-toothed dolphin’s smooth, uncreased forehead gives it an almost reptilian profile quite unlike nearly every other dolphin species sharing the same open ocean.
Overview
The rough-toothed dolphin, Steno bredanensis, is a distinctively shaped, deep-water dolphin native to warm temperate and tropical ocean waters across a broad range spanning the Atlantic, Pacific, and Indian Oceans. Its unusually smooth, crease-free head profile, finely textured teeth, and tendency to associate with other cetacean species make it one of the more visually and socially distinctive dolphins found in the world’s warmer oceans.
A profile unlike almost any other dolphin
While most dolphins show a clear crease where the forehead meets the beak, the rough-toothed dolphin instead blends the two into one smooth, sloping line, a subtle but genuinely distinctive feature among its family.
Status
Least Concern overall but decreasing in parts of its range, widespread across suitable deep warm ocean habitat throughout the Atlantic, Pacific, and Indian Oceans.
Rough-Toothed Dolphin: common questions
Why does the rough-toothed dolphin look different from other dolphins?
This species has a distinctively smooth, sloping forehead that blends seamlessly into its beak without the clear crease seen in most other dolphin species, giving it an unusually streamlined, almost reptilian profile that makes it fairly easy to distinguish once you know the feature to look for.
Why is it called the rough-toothed dolphin?
This species has teeth with a fine, rough surface texture visible under close examination, a distinctive dental feature that gives the species its common name, though this roughness is generally only noticeable on close inspection rather than being visible from a distance.
Does the rough-toothed dolphin interact with other cetacean species?
Yes, this species has been observed associating with other cetacean species, including pilot whales and other dolphins, sharing space and occasionally interacting during encounters at sea, a social flexibility that adds to its overall behavioural profile.
Does the rough-toothed dolphin prefer coastal or deep water?
This species strongly prefers deep offshore water, generally avoiding the shallow coastal areas favoured by some other dolphin species found in overlapping regions, making it a less commonly observed species close to shore.