Colombia is a global “hotspot” for spider species.
More than 580 of those identified there are believed to be endemic; they have only been seen in Colombia…knowingly, at least, by human eyes.
I do not know the pictured spider’s species, nor its particular specialty/niche.
My hunch is that it is semi-aquatic; I suspect that it actively hunts its prey, rather than “trapping” them in a web or pit.
I can confirm that its legs were very long; they spanned a considerable portion of the relevant rock, which was not merely a pebble
The pictured spider appeared to be not at all alarmed by our presence.
This post’s photo was taken in a “pocket” of forest not very far from the previous post’s location, & on the same morning.

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