SovietUnion wrote:They spawn more often on the edge of the world. I live 10 minutes walk from the end of the world and I keep seeing at least one a day.
Seems they spawn less likely in the centre
I don't know what you are basing that information on exactly, I have three bases, one close to the Ring of Brodgar (centre) and the other two are both more central than the edges and I see them all the time too, at least one in most playing sessions. Recently there were two either side of a swamp and a third another 15/20 mins later.
The myth comes into play as to what happens when you follow them, some saying they lead you to treasure of some kind, i.e, curio's, I used to believe this was true as the first couple I followed led me to edels and the other to a bluebell but, since then, they have just led me around in circles for the majority of the time and one straight into the path of a bear, lol, being on a lowly alt and zoomed in, this was not good news. I rarely bother now.
Personally I think they should drop high q seeds if you follow them - tree seeds naturally - as other than giving you a fright they seem pretty pointless.