General Biology of Gray Squirrels
Gray squirrels (Sciurus carolinensis) typically
are gray on the top of the body and
have a white underside. The gray squirrel
measures 18 to 20 inches long, its broad
bushy tail accounting for about half its
length, and weighs 1 to 1.5 pounds. Most
adult gray squirrels first breed in mid-
December or early January, and 5 to 10
percent of older females may breed again
in June.

All informations comes from http://wildlifecontrol.info/pubs/Documents/Squirrels/Squirrel_factsheet.pdf