Welp, scratch the New York Times off my list of news sites. That goes straight to a login page now. No article, nothing.
It is the equivalent of linking to a paid book on Amazon and having a discussion about the book's content.
The link works fine if you haven't disabled cookies - and that's on the user as much as it is on the NYTimes.
I'd wager, without proof for the moment, that the majority of books discussed on HN are 'paid books' at Amazon or elsewhere.
But yeah, despite the increasing prevalence of legitimate free-to-air soft copies of books, paid is still the default.
Open an Incognito window in Google Chrome. Go to nytimes.com. Search for "Common Swift Bird". Sort by "newest". Go read the article.