A German scientist did a study and showed a group of 6-month-old babies the same size and color of pictures, some of which were flowers or fish, and some were spiders or snakes. As a result, When looking at pictures of flowers or fish, the babies did not respond significantly, and when they saw pictures of spiders or snakes, all babies' pupils became significantly larger. Therefore, the scientist believes that people ’s fear of dangerous animals Innate, not acquired. To reach the above conclusions, the important prerequisites that need to be added are:. ['Everyone expresses their fears differently.', 'All babies have seen real flowers or fish.', 'Dilation of the pupil is one of the signs of stress or fear.', 'Most adults have a fear of seeing a spider or snake.']