Why do we find some animals ugly? Conservationists have long known about the Bambi Effect - where cute animals with big eyes (or majestic miens) attract the most funding and attention. Scientists are also trying to understand why certain animals seem the opposite way and repulse us instead. It seems that animals which look uncannily like us - but not quite - seem to elicit disgust, as well as those which appear like they might be diseased (e.g. mottled, hairless skin).
More generally, psychologists are increasingly interested in the topic of disgust, and how this primitive emotion might affect even higher-order judgments and decisions that we make.