CONSIDERABLE attention has been paid in the past to the actions of various diving ducks when submerged.The earliest records that I can find are those of that painstaking naturalist, William Macgillivray, during the first half of the last century.On this side of the Atlantic, E. H. Forbush has probably written more on this subject than any other author and in his work on the Birds of Massachusetts he has compiled his own records with those of other observers.
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Allan Brooks (1945) studied this question.