Why do they have long eyelashes?

Please provide me with more context! "They" could refer to many things.

For example:

* Humans: Long eyelashes can be a genetic trait, but they also can be due to makeup or lash extensions.

* Animals: Some animals have long eyelashes for protection (like camels) or for attracting mates (like peacocks).

* Characters in a story: Long eyelashes are often a feature of beautiful or innocent characters.

Tell me more about who "they" are, and I can give you a more specific answer!