How do you get a durtle?

[BIsTheAnswer]

Some Durtles come with references to the posts you obtained them from. You seem to have gotten yours from this one:

Do you keep notes of your WaniKani progress or not, and why?

I’ve been toying with the idea of making my own notes of vocabulary and kanji learnt through WaniKani but I’m not sure whether that would be a waste of time? Should I be making my own notes or just kanji and vocabulary found in the wild and not encountered yet on WaniKani? If you do make notes how do you organise them? EDIT: I’m hoping this belongs in this subforum but I was toying with putting it the other one.

No idea on the logic behind it though. Durtle logic eludes me.