Threatening behavior causes a fight-or-flight response in animals.
All animals, including fish, are in the animalia kingdom.
Threatening behavior causes a fight-or-flight response in those in the animalia kingdom.
What behavior causes a fight-or-flight response in those in the Animalia kingdom?
  some mammals
  insects
  bullfrogs
  reproductive
  nurturing
  threatening
  foraging
  hypothyroidism