Hi Nancy and Tweeters:
I just downloaded some information about Douglas Squirrels from the great
website from WDFW, Living with Wildlife,
http://wdfw.wa.gov/wlm/living/index.htm (See part of that info below.)
The website information is based on the book written by Russell Link, a WA
Dept. of Wildlife Biologist.
When you open the site, click on one of the following: Mammals, Birds
(think Flickers hammering on the roof), Reptiles & Amphibians, Other.
I am about to look up Sugar Ants, which are a recent addition to my kitchen.
Ick! I hope I can find that info under "Other".
Here is some info about squirrels.

Reproduction
a.. Depending on the species, tree squirrels mate from early winter to
late spring. One litter of two to four young is produced from March to June.
b.. All except flying and western gray squirrels may produce second
litters in August or September.
c.. At about 30 days of age, the young are fully furred and make short
trips out of the nest. At about 60 days of age, they begin eating solid
foods and venture to the ground.
d.. At about three months of age, juvenile squirrels are on their own,
sometimes remaining close to the nest until their parent's next breeding
period.
e.. The second litter may stay with the mother in the nest through the
winter until well after the winter courtship season.

Reported by Carol Schulz
Des Moines