I am not trying to offend anyone, but how can people identify as non binary gender?

Anonymous
I mean, I get transgender, but there is no such thing as non binary identity in other mammals. Even if they identify as both genders in ideology, it still in the binary.
What does that mean? Where did they get the idea from to how to identify? Is this a social thing for attention?
Updates:
2 mo
Even my transwoman friend don't get what it is...
I am not trying to offend anyone, but how can people identify as non binary gender?
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