This is the 1939th most frequent Spanish word.
regresar
To return or go back.
In this sentence, 'regresar' is used to express the action of coming back or returning to a place previously left, specifically 'home'.
Voy a regresar a casa después del trabajo.
I will return home after work.
Here, 'regresar' is applied in a subjunctive form to convey a wish or hope of someone returning.
Espero que regreses pronto.
I hope you return soon.
In this context, 'regresar' describes the habitual action of the ducks migrating back to a place during a specific time of the year.