Naked mole rat: An animal that instantly gives one the heebie-jeebies. The hairless rodent is unique in appearance which is not particularly cute.
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Proboscis monkey: Found in Borneo, the proboscis monkey has an unusually large nose and a bloated belly. Though the nose may look ugly to us, the female monkeys are attracted by it.
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Aye-aye: Native to Madagascar, the aye-aye is closely related to the lemur. Its long, pointed face and huge eyes are enough to give someone a scare.
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Warthog: Native to Africa, the warthog is characterised by its tusks and wart-like bumps on the face -- giving it a rugged appearance.
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Sloth: These ultra-slow creatures eat algae that grow out of their own fur, making them instantly unlikeable.
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Blobfish: With its gelatinous body and a perpetual frown face, blobfish is often regarded as one of the ugliest animals on the planet.
Southern elephant seal: The strangely shaped lump, doubling as a nose, that dangles from the face of a southern elephant seal makes it an odd-looking animal.
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Babirusa: A wild pig native to the Indonesian islands, babirusa's bizarre look is characterized by its upward-curving tusks. Though it doesn't add to its attractiveness.
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The California condo: This vulture makes the list of ugly animals due to its fleshy, purplish-pink bald head and pudgy jowls.
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Purple frog: While other frogs are no lookers either, the purple frog stands out for its bloated body, small head and striking purple skin.