Common bottlenose dolphin

The cowfish, despite its name, is actually a species of dolphin known scientifically as Tursiops truncatus. These sleek swimmers are found in coastal and offshore waters, recognized for their curved mouths that give them a permanent 'smile'. Genetic studies suggest there may be more hidden diversity within this species than previously thought.

• Their distinctive curved mouth resembles a friendly smile.
• Genetic differences exist even between nearby dolphin groups.
• Scientists suspect this single species may actually be several.