WordNet
n. fox squirrel or gray squirrel in the black color phase
Wikipedia
The black squirrel occurs as a melanistic subgroup of the eastern gray squirrel and of the fox squirrel. They are common in the Midwestern United States, eastern Canada, and parts of the Northeastern United States and the United Kingdom.
Usage examples of "black squirrel".
Isaac knew the habits of the black squirrel, that it was a denizen of the wildest woods and frequented only places remote from civilization.
The song of the hermit and the sight of the black squirrel caused Isaac to stop and reflect, with the result that he concluded he had gone much farther from the fort than he had intended.
He caught a glimpse of a black squirrel moving through the snow-covered branches of an oak, and paused to study the silvery web of an empress spider.
Farrell saw a deer, a black squirrel, and--in marshy ground, when the cars splashed across a shallow brook--the footprint of a very large cat.
There's a little patch of grass in front of an apartment building a few feet away, and an equally glossy, fat black squirrel crouches in the middle of it, nibbling a nut.