The summary provides key details about 10 strange animals in 3 sentences or less: The horn of the narwhal is a tooth, the yeti crab doesn't have eyes, and the moonfish is the biggest bony fish. The uakari don't have fat in its face, the galicus atlanticus is a kind of sea slug, and the pink fairy armadillo can be buried in a few seconds. The density of the blobfish is lower than water, the nose of the star-nosed mole are sensory receptors, and the aye-aye is the biggest nocturnal primate while the mole rat is considered the ugliest animal in the world.