People who had this thought have also liked "The Dark Forest" and "Death's End" by Liu Cixin :) (These are part 2 and 3 in the "Three Body Problem" series.)
"We've been sitting in our tree chirping like foolish birds for over a century now, wondering why no other birds answered. The galactic skies are full of hawks, that's why. Planetisms that don't know enough to keep quiet, get eaten".
