"Although swans only reach sexual maturity between 4 and 7 years of age, they can form socially monogamous pair bonds from as early as 20 months that last for many years, and in some cases these can last for life."

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jā, bet kāpēc. kāds evolucionārs izskaidrojums ir tam, ka viņi gadiem ilgi neatiet viens no otra vairāk kā rumpja attālumā? citi putni, lai cik monogāmi, tomēr plivinās arī atsevišķi.

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