There’s an interesting group on one of the most popular photo hostings, where anyone can post a photo of an animal or an insect, the size of which is preferable to be measured in millimeters and the weight in grams.
You’d be surprised how many animals there are that can actually fit on a human finger. By the way, one of the mandatory conditions for posting photos in “Tiny Animals on Fingers” group is the presence in the photo of the human hand. There’s no sense in naming all the animals in there. You better see for yourself.
Photo by flickr