The transparent-headed Pacific barreleyes may steal fish from siphonophores (such as this one photographed in 2001)—jellies that can grow to more than 33 feet (10 meters) long, according to researchers who released new barreleye findings and pictures on February 23, 2009.

The barreleye's flat, horizontal fins may allow it to swim very precisely among the siphonophore's stinging tentacles—and if the fish fumbles, the clear, helmet-like shield may protect its eyes, according to MBARI scientists.

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