Threatening behavior causes a fight-or-flight response in animals.
Fear also causes adrenaline to surge, which is part of the fight or flight response.
Threatening behavior causes adrenaline to surge.
threatening behavior causes

1: to move people
2: population movement
3: adrenaline to surge
4: hypothyroidism
5: a pathogens
6: Plant growth is reduced
7: Greenhouse gasses
8: hyperthyroidism