Northern elephant seals are large and imposing, with significant differences in size and shape between sexes (sexual dimorphism).
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Dimorphism
Synonyms for "dimorphism"
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This is also done for Dizygopleura landesi Roth and Eukloedenella pontotocensis Lundin, new species, which illustrate domiciliar (kloedenellid) dimorphism.
Source: wiktionary