RattlinFan99 you have come to the right place!! I've put the COMPLETE lyrics on the Lyrics page of this very site. Fully written out, every verse, every cumulative repetition. No abbreviations. I spent an embarrassing amount of time getting this right.
The order (in the version I learned): tree, limb, branch, twig, nest, egg, bird, feather, flea, hair. Some people do "branch" instead of "limb" and skip straight to "twig" but I think the limb/branch distinction is important. And yes, some versions go further than the flea but the hair is a good stopping point.
Also: it's a folk song. There IS no single "correct" version. But mine is correct. ☘
~~ BogLord2002 ~~ Webmaster of The Rattlin' Bog Fan Shrine ~~ Est. 2002 ~~