Timing the Under-water Activities of Diving Birds
01 August 1939
Main paper
ACCORDING to the 20-10 seconds rule the average period of the dive in 6 feet of water is 20 seconds, and it is suggested that of this period, 10 seconds are spent in going up and down and 10 seconds on the bottom in search of food (Dewar, 1924). As a dir...
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