How did butterflies get their name? Why are they called “butterflies”? No one knows for sure, since the word has been in the English language for centuries.
The Anglo-Saxons used the word ‘butterfloege’ because their most common butterfly was the yellow brimstone butterfly. It seems that this English influence was brought to the new world. In the colonies, people claimed that at night, witches would turn into winged creatures and steal butter
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http://www.dailynews.lk/2007/11/17/fea10.asp