twig catfish images - Joel Sartore

A male twig catfish (Farlowella acus) at the Dallas World Aquarium.

A male twig catfish (Farlowella acus) at the Dallas World Aquarium.

A male twig catfish (Farlowella acus) at the Dallas World Aquarium.

A male twig catfish (Farlowella acus) at the Dallas World Aquarium.

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National Geographic Photographer and Speaker