A data analysis of animal gender in children's books

I just came across a TV Tropes article about this: https://tvtropes.org/pmwiki/pmwiki.php/Main/SpeciesEqualsGen...

My grandma has dementia, and she can never remember what sex individual animals are, so to her all cats are female and all dogs are male.

I think of how ‘bird’ is an archaic slang for woman.