I am starting a new report thread for myself since we lost our old ones, I suggest everyone does the same, report any new findings or anything you feel is important.
September 1st, 2012 I found myself in a dark swamp inhabited by Otamamon, there were small hut-like structures made of mud and leaves, I'm not sure if they Otamamon had constructed these themselves or if they were the doing of Geckomon, as they often are seen in together.
Nothing seemed out of the ordinary until I noticed a large tree with a hole in it, I felt around the tree and it started to crumble around the hole, revealing it to be hollow, I noticed other trees like this as well, they seem to be rotting? Unsure what is causing it, maybe it's normal, but it's odd for trees to rot in their natural environment, perhaps a toxin in the water is the cause. Show caution if in the area.