From: ‘Artificial selection for male winners in the Siamese fighting fish Betta splendens correlates with high female aggression’, A. Ramos and D. Gonçalves (2019), Frontiers in Zoology 16:34 https://frontiersinzoology.biomedcentral.com/articles/10.1186/s12983-019-0333-x#Sec6 Differences between males and females (sexual dimorphisms) in animals are odd. Males and females have significant differences in their reproductive organs and hormone profiles, and in …
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