About gay .... flamingos

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Yahoo news has reported that a pair of gay flamingos in London have adopted an abandoned chick. They have been together for six years. They have advantage over their human species - male flamingos are able to produce milk in their throats. That's not the shocking news. A spokeswoman says that gay flamingos are not uncommon. I wonder if this scenario in the animal kingdom is limited to flamingos? It's interesting to read and a little quirky in my opinion, so it's gonna take me a longer time to get used to this idea.