Size
Full-grown peacocks are usually five feet tall and 35 to 50 inches wide, depending on whether or not their feathers are out. If you're scared of small birds such as pigeons, robins, and thrushes, witnessing a bird of this size may be frightening. Even people not typically frightened by birds may shudder at the sight of such a large creature in their presence. People may also fear for their children around peacocks because they loom over the typical child.
Intrusive Behavior
Although peacocks are sometimes frightened and turn to flight when they encounter humans, some don't fear people at all. Rather than run away, these peacocks walk up to someone to investigate. They'll sometimes follow people, too, particularly ones who carry food.
Chasing
Peacocks sometimes enjoy chasing other creatures, including humans. Even someone not typically afraid of birds might seek cover when chased by a peacock. After it has caught up to someone, it's not uncommon for a peacock to circle around someone while pecking and screeching. If there are other peacocks in the area, these peacocks may join the original peacock in tormenting someone. Although they don't normally inflict any kind of severe bodily harm, this fact may be of little comfort to someone being surrounded and pecked by a group of peacocks.
Wing Span
When peacocks flash their feathers, they appear even larger. More than 60 percent of a full-grown peacock's width is made up of its feathers. When peacocks are startled, they often resort to flight to leave harm's way. However, if you stumble upon a peacock and both you and the peacock are frightened, the peacock's flight response will give it the appearance of rapid growth and likely provoke a greater level of fear.
Noise
The loud screeches peacocks make are often sudden and startling. Peacocks especially like to make screeching sounds in the early morning, and these screeches are typically loud enough to awaken residents throughout multiple neighborhoods.