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a swordfish: a large fish with a very long upper jaw that resembles a sword
Note: Recent research has just shown that a muscle "heater" around the eye increases it's temperature from 10 to 15 °C. The purpose of this would be to improve the optical capacity of the swordfish and to thus improve its predatory capacity.
Swordfish (Xiphias gladius) are large, predatory fish characterized by a long, flat bill.

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