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Or are they not?
I've always "known"(been told, that is;)) that swans mate for life. And if one of them dies, the other one might kill her/himself too. Wonder why that is so. Obviously swans aren't mammals, but it's still interesting. Are there any other monogamous animals around too?
Depends on your definition
There are a few (1-2%) socially monogamous birds and mammals...but now that scientists have DNA testing, guess what? NO *sexually* monogamous animals. Mother nature likes to keep the gene pool fresh. She doesn't care about true love. Sorry.
Story from NYT: http://www.nytimes.com/2008/03/18/science/18angi.html?em&ex=1205985600&e...