The initial AI verdict was softened after source quality and evidence strength were reviewed.

Verdict MIXED

MIXED — A shark is the only known fish that can blink with both eyes

Verified on April 16, 2026

Under comparative biology, the claim fails because mudskippers evolved bilateral blinking to survive on land. Mudskippers blink by retracting eyes into sockets, refuting the shark's supposed exclusivity.

Confidence49%

How strongly independent, cited sources support this verdict.

Claim reviewed

A shark is the only known fish that can blink with both eyes.

Analysis summary

Under comparative biology, the claim fails because mudskippers evolved bilateral blinking to survive on land.

Evidence profile

Key findings

Mudskippers blink by retracting eyes into sockets, refuting the shark's supposed exclusivity.
Sharks use nictitating membranes for protection, whereas mudskippers blink for hydration and cleaning.

Sources

Analyzed across 1 independent publisher

Shark Senses Shark Trust

Citations

Copy formatted citations from the verified sources above.

Need to verify another claim?

Open Claims Radar to analyze headlines, posts, or links with live source checks.

Verify a claim