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
MuirÍN	-	Irish
Visvaldas	-	Lithuanian
Fotios	-	Greek
Golda	-	Yiddish
Liza	['laizə]
Wangi	WAHNG-ee (Indonesian)	Indonesian, Malay