Mate, B. R., Duley, P., Lagerquist, B. A., Wenzel, F., Stimpert, A., & Clapham, P.. (2005).
Observations of a female North Atlantic right whale (Eubalaena glacialis) in simultaneous copulation with two males: supporting evidence for sperm competition.
Aquatic Mammals,
31, 157-160. doi:10.1578/AM.31.2.2005.157
OREGON STATE UNIVERSITY
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