scarcer than hen's teeth

be as scarce as hen's teeth and scarcer than hen's teeth (exceptionally rare; very difficult or impossible to find) — раз два и обчелся; днем с огнем не сыскать;

Example 1: On a rainy night, taxis are as scarce as hen's teeth.

Example 2: It was the President's inauguration and hotel rooms in Washington were as scarce as hen's teeth. (CIDI)

Since hens have no teeth, this term in effect says that something is so scarce as to be nonexistent. (

see also
[like gold dust]