Uroplatus fimbriatus

Photo source: Nicolas Cegalerba
It's a stretch to call geckos, even these Uroplatus fimbriatus, flat-tailed geckos, ugly. But they are reptiles, and they do lick their own enormous eyeballs. That's a good start. Another test I run on any prospective ugly: would my daughters scream at seeing one clambering up their bedroom wall? Yes, they would.