Where are they found?
American red squirrels range from west to east and north to south in the United States, though their populations are not continuous across that span. They can also be found on the island of Newfoundland, Canada.
What do they eat?
American red squirrels are omnivorous, meaning they eat plants as well as meat. Red squirrels will eat seeds, nuts, and fruit, as well as eggs and mice. They are also territorial--more so than other species of squirrels in North America.
How do they act?
Individual red squirrels often have multiple nests that are in tree branches or trunks that they can use. They spend a lot of time on the ground, despite being well adapted for climbing through the trees.
Are they endangered?
American red squirrels are listed as "Least Concern" on the International Union of Conservation of Nature (IUCN) Red List of Threatened Species.
Mammal Moment
Some American red squirrels gather pinecones in hollow logs or tree stumps that act as food stores during times when food is hard to find. Some of these stashes, which may be used for multiple generations of squirrels, can be thousands of pinecones big--even up to 18,000!
Sources: http://www.waza.org/en/zoo/visit-the-zoo/rodents-and-hares/tamiasciurus-hudsonicus
http://www.arkive.org/american-red-squirrel/tamiasciurus-hudsonicus/