Moqo-Moqo is also an accumulator - of photographs. I particularly like the fact that Moqo-Moqo is themed to the biological diversity of the natural world. In recent years he/she seems to have added a bit of commentary or identification of the subject, but for the most part the emphasis is on the visual image.
Another reason I'm offering a recommendation is that unlike many (?most) other photoaccumulators, this one makes a reasonable effort to give credit to the source of the photo, either via text or via a link embedded in the photo. Sometimes, as with the indigo bunting above, the link goes to the photo itself; other times (and less optimally) it goes to a Flickr photostream's front page or to another accumulator. But at least the effort and courtesy is made.
Whenever TYWKIWDBI starts becoming dreary from a run of posts about business, politics, ethics, crime etc, I can always lighten the mood with some nature photos from Moqo-Moqo. If you like that subject matter, give it a browse at the link.