What is it called when an animal gets scared it responds by running away or fighting this is known as what?

When an animal gets scared and responds by either running away or fighting, this is known as the "fight or flight" response. This instinctual reaction is triggered by a perceived threat and prepares the animal to either confront the danger or escape from it. The response involves physiological changes, such as increased heart rate and adrenaline release, to enhance survival chances.