A hen (gallina, hembra) you may know.
Do hens have teeth? No – they have beaks (picos).
There is an expression or saying “as rare as hen´s teeth”. If something is rare (raro) or difficult to find, you can say “it is as rare as hen´s teeth”.
Some examples:
- Good politicians are as rare as hen´s teeth (…tan raros de encontrar).
- Bibles are as rare as hen´s teeth in North Korea.
What else is as rare as hen´s teeth?