Wave-Riding Dolphins*

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Abstract
In an effort to explain the apparent ability of dolphins to ride the bow wave of a ship at a speed of 10 knots (Woodcock, 1948) it seemed necessary to show that the animals had weight while immersed. Measurements of the weight of an immersed Stenella plagiodon have been made.‡ First results indicate that a dead animal, which weighs 200 lb. in air, and is 6·5 ft. long, weighs 9·2 lb. when immersed in sea water. This animal, which was in good physical condition, was killed by injection just before the weighings were made.

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