This is the 2947th most frequent Spanish word.
volverán
"Volverán" means "they will return."
The word 'volverán' here is used in the future tense to describe a planned action of returning to a place.
Ellos volverán a visitar su ciudad natal este verano.
They will return to visit their hometown this summer.
In this context, 'volverán' predicts the future action of the birds coming back to a specific location.
Los pájaros migratorios volverán cuando termine el invierno.
The migratory birds will return when winter ends.
Here, 'volverán' is coupled with 'a abrir', signifying the act of reopening something in the future.