No rule for this one
No ending or word group predicts the article of Huhn. Learn it as a pair and say it out loud: das Huhn.
das Huhn
It's das Huhn. Huhn is neuter, plural die Hühner.
Das Huhn ist gebraten.
The chicken is roasted.
No ending or word group predicts the article of Huhn. Learn it as a pair and say it out loud: das Huhn.