Big Bertha floats peacefully and silently in the water with her Baby Cheeps in her mouth, oblivious to anyone's presence until they get too close. If a plumber or a Yoshi happens to be near, Big Bertha will suddenly turn her gaze towards them, eyeing them hungrily, a subtle warning that she is a carnivorous fish. She makes no verbal greeting, but her gaze alone is enough to intimidate.