This is the 16007th most frequent Russian word.
птичьему
"Птичьему" means "to the avian" or "to the bird's" (dative singular form of "птичий," relating to birds).
The word 'птичьему' is used as an adjective in the dative case to describe offspring belonging to birds.
Я помогаю птичьему потомству выжить.
I help the bird offspring survive.
Here, 'птичьему' is an adjective in the dative case that describes the chirping attributed to birds.
Мы прислушиваемся к птичьему щебету утром.
We listen to the bird's chirping in the morning.
This usage of 'птичьему' involves the dative case adjective form as it describes the family of birds.