As rare as hens teeth

I've 2 phrases that that I'm curious about in regards to use and origin

Rare as hens teeth... and... For love nor money. Any ideas?

scarcer than hen's teeth -- Hen's don't have teeth. One reference says it is an Americanism that probably goes back to colonial days but was first recorded in 1862. Encyclopedia of Word and Phrase Origins by Robert Hendrickson (Facts on File, New York, 1997). Page 595.

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