Quote:
Originally Posted by Gudy
Philip Pullmans Dark Materials series comes to mind, book three (The Amber Spyglass) specifically. It had aliens which used the round and nearly indestructible seeds of a tree as a kind of unicycle to whiz along the naturally produced "highways" on the planet.
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Yes! That was it! Thank you.

For some reason I was thinking that it was a short story which is probably why I couldn't remember.