How can a monster be based on a true story?

Answer 1

A monster can be based on a true story through misinterpretation. For instance, in some areas with large, unknown animals in the wild. People might see a strange - looking creature from a distance, or in poor lighting, and their fear and imagination can turn it into a'monster'.

Answer 2

Sometimes, historical events can create the basis for a monster. For example, if there were a series of unexplained killings in a certain area in the past. The killer or the circumstances around the killings could be exaggerated over time, and a fictional monster could be created to explain the events. People might start believing that a supernatural being was responsible for the killings, thus creating a monster based on a true, although distorted, story.