Question #150273. Asked by 
psnz. 
Last updated Dec 07 2023.
Originally posted Dec 07 2023 9:01 PM. 
 
                        
Although free-swimming when young, these males effectively become parasites, attaching themselves to the females, feeding off the nutrients in her blood and ultimately being used only to supply sperm for reproduction.
 https://images.app.goo.gl/JEDzcrzYHksMRWDH6
 https://images.app.goo.gl/JEDzcrzYHksMRWDH6 https://www.guinnessworldrecords.com/world-records/84475-largest-sexual-dimorphism-in-the-same-species
 https://www.guinnessworldrecords.com/world-records/84475-largest-sexual-dimorphism-in-the-same-species|  | 
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