I've done some casual googling, and everyone seems to know jungle saplings are rare, but no one seems to talk about why they're rare. As far as I'm aware, the only special thing about jungle wood is that you need it to farm cocoa beans. Certainly the trees are unique in appearance and come equipped with vines, but that's hardly a special or hard-to-obtain item.

If anyone has some insight or trivia on why their drop rate is half that of all the other trees, I'd love to learn it. Thank you.