Which species has the greatest degree of effective polygyny?

Name: Which species has the greatest degree of effective polygyny?
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Elephant seals have the greatest degree of effective polygyny. Male elephant seals gather harems of up to 100 females during the breeding season, with the size of a male's harem often determined by his body size and fighting ability. This extreme degree of polygyny can result in some males fathering hundreds of offspring in their lifetime.

Which Species Has the Greatest Degree of Effective Polygyny