Romance among the angels by Andrey Narchuk (Russia). Sea angels are molluscs related to slugs and snails, with wing-like lobes used as swimming paddles. They are both male and female and here they prepare to insert their copulatory organs into each other to transfer sperm in synchrony. Finalist 2017, Behaviour: Invertebrates. (Photo by Andrey Narchuk/2017 Wildlife Photographer of the Year)
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