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Monogamy = extinction. No wonder humans cheat
No, humans were the cause for their extinction:
"The species became extinct from a large range of problems, including mosquito-transmitted diseases, introduction of mammalian predators, and deforestation. "
More like having your habitat invaded and destroyed equals extention. Penguins and swans mate for life, as well as a plethora of other critters, and they're fine. Just say you got a wander dick.
What even makes you think they were? Aren't singing birds as a general rule polygamous?
Not defending the original comment but the image does say they mate for life.
Point
I agree. I hate monogamy and traditional families. Cheating, cucking and orgies should be mainstream.