People who have a strong interest in and knowledge of something specific, like dog breeders or bird enthusiasts.
From 'fancy' (to like or enjoy) plus the suffix '-er' (one who) and '-s' (plural). The term has been used since the 1600s to describe people with specialized hobbies or interests.
Pigeon fanciers in Victorian England were so passionate that they created over 100 different breeds from one wild rock pigeon—showing how human interest and selective breeding can completely transform animals!
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