This is the 13928th most frequent Polish word.
porannych
"Porannych" means "morning" (adjective, plural, genitive).
"Porannych" is an adjective qualifying "ptaków" (birds), referring to birds active in the morning.
Dźwięk porannych ptaków jest bardzo relaksujący.
The sound of morning birds is very relaxing.
In this sentence, "porannych" is used as an adjective modifying "gazet", indicating their characteristic of being relevant to the morning.
Lubię czytać porannych gazet.
I like reading morning newspapers.
Here, "porannych" describes "promieni" (rays), specifying their occurrence during the morning.