Cowfish Identification Guide

Key identification features

• Box-shaped body encased in a rigid bony carapace, much like other boxfish
• A pair of forward-pointing, horn-like spines projecting above the eyes, the feature that gives the group its name
• Some species add a second pair of spines near the rear of the body or belly
• Small, thick-lipped mouth and small, high-set eyes
• Patterns of blue spots, fine lines, or hexagonal markings that vary by species
• Slow, deliberate swimming powered by small fin ripples rather than body flexion

Common look-alikes

Boxfish (Ostracion species) share the same rigid carapace but lack the horn-like spines above the eyes that define cowfish. Trunkfish have a broadly similar box shape but differ in the number and position of body spines, which is the most reliable way to tell the two groups apart in the field.

Where you'll see one

Cowfish occur on tropical reefs, seagrass beds, and sandy lagoon margins across the Indo-Pacific and western Atlantic depending on species, usually moving slowly and alone over open bottom near cover.