Those two dots on this fish’s face aren’t its eyes. They’re its nostrils.
Its real eyes are the green tubes inside its transparent head.
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The fish with eyes inside its transparent head
The barreleye’s eyes can rotate inside a transparent, fluid-filled shield.
They point upward to spot prey overhead, then turn forward when the fish feeds.
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The fish with eyes inside its transparent head
For decades, illustrations missed the transparent dome: it was usually destroyed when the fish was caught in nets.
Deep-sea cameras finally let researchers see the animal intact.
