I love the phrase going down a rabbit hole, but it got me thinking, do rabbits even dig that deep to begin with? And what organisms (besides humans) might dig deeper that might be even more fun to tweak that phrase with?
Edit: Specified in title/body that I had meant to ask about non-human organisms. Still, there’s some cool info about deep human digs in the comments below for digfolks!
That sounds like some pretty dedicated earthworms! Also, as noted in another comment about the Alice reference, that’s a good point, albeit I guess one could say it’s about more of a figurative depth than literal given the curious places they go!