a behavior that occurs only in adult fish a behavior that occurs only in small mammals a behavior that an animal learns how to do over time a behavior that an animal is born knowing how to do
I gave my students this multiple choice question: Which of the following describes an instinctive behavior?

Only one answer is correct among these 4 choices:
- a behavior that occurs only in adult fish
- a behavior that occurs only in small mammals
- a behavior that an animal learns how to do over time
- a behavior that an animal is born knowing how to do

Could you tell me which one is correct?

a behavior that an animal is born knowing how to do