hens' teeth

Something very scarce (because hens have no teeth). Typically used in phrases like "rarer than hens' teeth." I can hardly believe your brother got an A on his final exam—grades like that are rarer than hens' teeth for him!

Common Names:

Name	Pronounced	Usage
Marcellina	-	Ancient Roman
Androcles	AN-drə-kleez (English)	Ancient Greek (Latinized)
Yafe	-	Hebrew
Quirin	KVEE-reen	German
Micah	MIE-kə (English)	Biblical, English
Moshe	-	Hebrew, Biblical Hebrew