SOLVED. YA Fiction - People live in really tall trees and ground is a myth. [s]

[Jeremy]

I read this series as a kid in the late 80s-early 90s. I think there were 3 books?

It involved a race/tribe/group? of people who lived in really tall trees and got around by using hang gliders/wingsuits. The trees were so tall that the ground was either a myth or legend (I think), but (SPOILERS!) at some point in the book they find the ground and have adventure(s) there.
Main character was a male teen.

Thanks for helping me figure this one out! It's been bugging me for years!

[Mai]

Below the Root by Zilpha Keatley Snyder? It's the first one of the Green Sky trilogy. It says it was first published in 1975.

Reader's comment:
A group of people inhabit the tree tops called Kindar. They are vegetarians and float from branch to branch using glider packs called Shubas.

[Andy]

That's just what I was going to suggest - "Below the Root," "And All Between," "Until the Celebration".

[Jeremy]

That sounds like it, I'll look into it. Thanks!

[Kris]

Here's the Google Books preview of Below the Root by Zilpha Keatley Snyder - https://books.google.com/books?id=JSt... There are different cover images.

[Jeremy]

Yeah, skimming that google preview, I'm now pretty convinced this is the series.
Memories coming back of where I had been mistaken (i.e. ground is forbidden, not a myth).

Thanks all! Now to re-read it!