Why is a polar bear baby called cub?

A polar bear baby is called a cub for the same reason that other bear babies are called cubs. It's a general term used for the young of bears, regardless of their specific species.

Here's why this term has stuck around:

* Historical Usage: The word "cub" has been used to describe young bears for centuries, dating back to the Middle Ages.

* Simplicity: It's a simple and straightforward term that everyone understands.

* Universality: It applies to all bear species, making it a universal identifier for baby bears.

While some species might have more specific names for their young (like a "whelk" for a baby seal), the term "cub" has remained the standard for all bear species.