Blue squirrels are squirrels with a blue coloration. The cause of this rare coloration has not been determined.
In a 1963 paper by Vladimir Andreyev, he reported that a rare species of blue squirrel inhabited parts of the taiga of the Sakha Republic. Another paper published in 1975 reported of blue squirrels being hunted for their pelts in the Soviet Union. The earliest known record of blue squirrels occurs in an 1884 paper published by the National Review documenting the trade of blue squirrel skins in parts of China and it's tributaries. Blue squirrels are also recorded in several Native American folktales.
- In 2012, a blue squirrel was photographed by Time Out London. No theories on its unique coloring were presented.
- A blue squirrel was spotted and photographed multiple times at a park in central Texas. The squirrel was nicknamed "Blue Nuts" by locals and it was determined to be non-aggressive and friendly. There are theories that it was an entirely new species of squirrel that had previously gone extinct.
- A blue squirrel was seen and photographed in Bend, Oregon in 2016. The squirrel had a blue tail and a theory was that it encountered blue tinted water.
- On December 21, 2016, a completely bright blue squirrel was spotted in North Florida. It was theorized that the squirrel's fur was tinted by blue paint or dye.
- Andreyev, Vladimir (Summer 1963). "Trampled Values in the Taiga". Modern Age. Chicago: Intercollegiate Studies Institute. 7 (3): 311–318.
- Likhanov, B. N. (1975). "GEOGRAPHICAL PROBLEMS IN THE ORGANIZATION OF TOURISM AND RECREATION IN THE SAYAN TERRITORIAL-PRODUCTION COMPLEX". Soviet Geography. 16 (4). doi:10.1080/00385417.1975.10640065.
- Gundry, R. S. (July 1884). "China and Her Tributaries". National Review. 3 (17).
- "Blue squirrel. – Now. Here. This. – Time Out London". Time Out Blog. August 15, 2012. Retrieved April 22, 2018.
- Veiszlemlein, Erika (November 5, 2015). "A New Blue Species". A Squirrel Blog. Penn State University. Retrieved April 22, 2018.
- Morris, Joan (January 7, 2016). "Oregon's blue-tailed squirrel — freak of nature or accidental tinting?". The Mercury News. Bay Area News Group. Retrieved April 22, 2018.
- Morris, Joan (January 25, 2017). "No hiding his fear — dachshund freaked out by owner's camouflage". The Mercury News. Bay Area News Group. Retrieved November 21, 2018.
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