Reading the article I guess Mark Twain never had a knowledgeable teacher.
Is there anything hacker news readers would like to know about the German language?
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It is ok to guess the sex of an animal wrong. The same way nobody (should) cares whether an infant is a boy or a girl.
You can enforce to be neutral be refering to "das Tier" and "das Kind". But since it is just a grammatical sex, why should anyone bother?
There are some culturally assumed defaults:
* a nurse is assumed to be feminine, unless the distinction is important
* a cat is assumed to be feminine, unless the distinction is important