This hairless squirrel is an extreme rarity and experts are at a loss to explain what causes the abnormality. He is living in the wild in our neighborhood in the country. He is bald, apart from some tufts of fur on his tail. Captured with a Canon EOS 5D Mark III with a with a Canon EF 100-400mm f4.5-5.6L IS II USM Lens, f/6.3, 1/2300, ISO 4000.