A way to view them all
Here's a tip for you guys. Zoom out as far as possible. Once you go high enough, the world will fade out and all that's left is the living creatures. And since darwinians are practically invisible from above, all you really see are the virii. So this is a great way to not only get a cool-looking image (if you do it at the beginning of an area), it's also a good way to find any virii you've missed.