Now let's scroll down to the Terminology section of the article. It is all about what the proper plural form of the word octopus is. It explains that octopuses is the most accepted plural of octopus. Here's what it says about using octopi as the plural: "octopi is misconceived and octopodes pedantic." (I like how pedantic is hyperlinked in the article so that I could click to learn what that term means).

I know that since the article appears on Wikipedia that it was authored by a variety of people. People often don't agree about what to write. To see what happened "behind the scenes" as an article was written, scroll back up to the top of the article's page and click the Discussion tab.

The Discussion page contains information that is not in the article and is often controversial. On the Discussion page (also called the Talk page) for Octopus, you can scroll down to a section called Octopuses? You can read what several different Wikipedia users have written about the plural form of octopus. There is a detailed conversation about the Greek root and Latin declensions. You can also read about a user's objection to using octopus as a collective noun. Besides reading discussions about grammar, you can read talk about how an octopus eats, octopus intelligence, and what the extremities are called.

Clicking the Discussion tab on Wikipedia articles can be very educational. This overlooked feature of Wikipedia can illuminate the editorial process and show that facts are often in dispute. Next time you're reading any Wikipedia article, click its Dicussions tab to see for yourself.