Welsh Proverbs - Diarhebion Cymraeg
Y mae dafad ddu ym mhob praidd.
Y mae dafad ddu ym mhob praidd. - There is a black sheep in every flock.
https://americymru.net/americymru/documentation/nouns/3041/praidd-flock
https://americymru.net/americymru/documentation/nouns/3041/praidd-flock