Why Genealogies?

[Inziladun]

Originally Posted by radagastly

Except, perhaps, the Ents.

Well, that's true. Due to their shrinking population and having their dwelling-place protected by an aura of fear, they were pretty much unthreatened. I'd put them apart from Elves, Men, Dwarves, and Hobbits though.
Also, Ents don't seen concerned with genealogies, probably because their family trees (ha!) would only have had a branch or two, due to their longevity and slow rate of breeding.