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ray, in zoology. The Columbia Encyclopedia, Sixth Edition. 2001-05 (Site not responding. Last check: 2007-10-09) |
 | | Unlike most rays, mantas are filter-feeders; the manta uses a pair of horns at the front of the head to drive small prey into its mouth; there the prey is caught in a strainer and swallowed, the water passing out through the mantas gills. |
 | | Electric rays, or torpedos (family Torpedinidae), have electric organs in their wings that generate electric current, used to immobilize prey and for defense. |
 | | The current is strong enough to stun humans, and it is said that the ancient Greeks used these fish for shock therapy. |
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