This is the 2282nd most frequent Turkish word.
birbirlerine
"To each other" or "to one another."
The word 'birbirlerine' here denotes the reciprocal action of 'helping one another' within the group of students.
Öğrenciler birbirlerine yardım ettiler.
The students helped each other.
In this context, 'birbirlerine' suggests the mutual action of 'looking at one another' among the animals.
Kediler ve köpekler bahçede birbirlerine bakıyorlar.
The cats and dogs are looking at each other in the garden.
Here, 'birbirlerine' is used to indicate the exchange of gifts between the siblings, emphasizing the reciprocal nature of the action.