American Red Squirrel
Overview
 
The American Red Squirrel (Tamiasciurus hudsonicus) is one of three species of tree squirrel
Squirrel
Squirrels belong to a large family of small or medium-sized rodents called the Sciuridae. The family includes tree squirrels, ground squirrels, chipmunks, marmots , flying squirrels, and prairie dogs. Squirrels are indigenous to the Americas, Eurasia, and Africa and have been introduced to Australia...

 currently classified in the genus Tamiasciurus and known as pine squirrels (the other are the Douglas Squirrel
Douglas Squirrel
The Douglas Squirrel is a pine squirrel found in the Pacific coastal states and provinces of North America. It is sometimes known as the Chickaree or Pine Squirrel, but since Chickaree is also used for the American Red Squirrel and Pine Squirrel for the genus Tamiasciurus, these alternative names...

 T. douglasii and Mearns's Squirrel
Mearns's Squirrel
Mearns's Squirrel is a species of rodent in the family Sciuridae. It is endemic to pine and fir forests at altitudes of in central Baja California in Mexico. This endangered species occurs in low densities and is threatened by habitat loss...

 T. mearnsi). American Red Squirrels are also referred to as Pine Squirrels, North American Red Squirrels, and Chickarees. It is a medium sized (200–250 g) diurnal
Diurnal animal
Diurnality is a plant or animal behavior characterized by activity during the day and sleeping at night.-In animals:Animals that are not diurnal might be nocturnal or crepuscular . Many animal species are diurnal, including many mammals, insects, reptiles and birds...

 mammal that defends a year-round exclusive territory.
 
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