I'm just glad the collectibles only show up in the center of the map. It's easier than having to look all over the place like in the other games.
Anyway, after you get your last power you'll find all those uncommon and rare collectibles, so don't worry too much about the ones that get lost.
I've completed collections in two tribes now, without playing any of them more than an hour a day. I have 5 tribes going at once, so there's no way I can spend that much time with any tribe.
Rockmower, I think it's a lot better in VV5 than in VV3, since in VV3 the chief could only point out a collectible once per 24 hours.
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Runners... never enough runners....