a bird building a nest a turtle burying its eggs a bear hibernating in winter a horse pulling a plow
I gave my students this multiple choice question: Which of these is not an instinctive behavior?

Only one answer is correct among these 4 choices:
- a bird building a nest
- a turtle burying its eggs
- a bear hibernating in winter
- a horse pulling a plow

Could you tell me which one is correct?

a horse pulling a plow