Illustrate the prototype theory, which is a new theory about cat

Illustrate the prototype theory, which is a new theory about categorization.
【正确答案】：According to the prototype theory, human categorization is based on principles that are far beyond those in the classical theory. When people categorize common objects, they do not expect them all to be on the equal status. They seem to have some idea of the characteristics of an ideal exemplar—a prototype. And they probably decide on the extent to which something else is a member of the same category by matching it against the features of the prototype. It does not have to match exactly; it just has to be sufficiently similar, though not necessarily visually similar.
For example, in the category BIRD, there are various members such as robin, sparrow, dove, parrot, ostrich, and penguin. Robins are considered the best examples, i.e. prototypes.