Wikipedia says-
“The Seneca white deer are a rare herd of deer living within the confines of the former Seneca Army Depot in Seneca County, New York.
The Seneca Army Depot closed in 2000 and sections of the fence were opened for traffic for the prison and other uses for the 10,600 acres in the middle of Romulus and Varick.
Besides the Army, guess who also left? Some of the white deer herd.
Wednesday night, I found four white deer in a field behind homes on the western edge of the village of Waterloo. That about 16 miles from the northern end of the former army base.
I can’t say exactly where the deer were, because homeowners on the street don’t want cars parking in front of their homes, but I was able to sneak into a back yard to take some pictures.
Wikipedia also says-
The Depot was created in 1941, a 24-mile (39 km) fence was erected around its perimeter, isolating a small herd of white-tailed deer, some of which had white coats. These deer are not albino, but instead have leucism, which is an abnormal genetic condition that carries a set of recessive genes for all-white coats.[1] While little is known about what caused leucism in the white-tailed deer, especially for this herd,[2] researchers have noticed that its isolation causes high levels of inbreeding.[3] With inbreeding, it leaves recessive alleles of the white-tailed population to be expressed.