How to find out the combinations of Views arguments that have the most Views result
Inside Drupal, this would take some real custom magic. But, let's say for example, you wanted to show

pets/birds,

pets/cats

both birds and cats would be arguments off the main Views page of pets. BUT - if you had a Google Analytics account, which does not understand Drupal arguments, you could easily decipher which page received what number of visitors.

Because Google will never discriminate vs what is a page and what is an argument, you can easily see what would be most popular as a result.