Is it possible you got a wild kitty?  Yes, some of our domestic cats that
have been outside too long and not enough contact with us humans can be
wild.  These can be somewhat hard to tame.  I suggest that you talk to a vet
or your local HS and see what they have to say ...you might be surprised.
Keep us posted as to what happens to the little one.

Rich
--

Yes, give him  p l e n t y  of time. They recommend three weeks until he's
settled in well. I guess if you leave him alone he'll soon wander about and
investigate the place. Maybe after a week you may stroke him. Don't force
things, you might ruin everything.

Carola

It takes time for them to feel and realise they are safe. That is why
they are so quick with protective instincts.

Let him set the pace. Let him realise you are safe and therefore he is
safe...

But one thing that does concern me....he may be carrying diseases that
can be past on to your other cats....

Are  your other cats protected againt fel aides and fel leukemia???

Give him LOTS of time. We've had Tonks since August 3, 2003, and we still
can't pet her.  She'll come up on the bed/couch with us but if we shift
positions she runs off.  She was a feral that was caught by a rescue
program, so we know she's fixed and had her shots.  We try to treat her
normally, talking to her in a calm voice and things like that. Good luck
with your kitty.

Nikki

The first thing to prepare for is failure. Some cats simply will not
tame. If the cat is happy outside and seems OK, I personally would trap
him, take him to the vet and get him vaccinated, neutered/spayed etc and
then released and carry on feeding him. Socialisation would be stressful
for him and the other cats and you have to decide if it would be worth
it.

If you want to tame him however then this site here has some excellent
advice. http://www.messybeast.com/feralkit.htm

Do not do what I'm recommending. It's crazy and I'm insane for
posting it:

When you get to the point of being able to hold the kitty or even
grab him or her for a second, grab her by the knap of the neck
with your own mouth just like a mother cat. Support her under
the tummy if needed but probably not because she is still a kitty.
There are at least three reasons why this works. It is an instinctual
response that a kitten normally has towards its mother and will
help the kitten bond with you. It puts the kitten completely incapable
of scratching or biting and give them a chance to relax and realize
that they aren't in danger. And it is a good position for them to feel
comfortable because their feet are in a position for landing correctly
and they won't have as much anxiety about being dropped because
they are in their natural landing position.

notes from the loony bin,

My little feral Bonnie took literally months. She was fairly young
when I trapped her and it was 2 weeks in a bathroom, then 2 months in
a cage before I could even let her explore her own room out of the
cage. The time in the cage was important for her to get used to an
indoor environment, get used to me and the other cats and they her,
have her easily accessable for vet visits if necessary (she was spayed
the day after I trapped her and recoup'd in the bathroom).  She had to
go through the series of shots after that so it was important that I
be able to handle her and that meant heavy welders gloves. If she was
let loose even in her own separate room it would have been impossible
to catch her.  As it was, she went to every vet visit for booster
shots in a trap.  Socialization in the beginning was done using a
brush taped to a long wooden spoon to pet her and when she got used to
being touched by that, my gloved hand petting her was next.  Taking
the gloves off to touch her was scary but she handled it well. There
have been scratches but no deep bites. Early on though, she bit hard
into the glove and that is why it is so important to keep yourself
protected in the beginning.

Depending on how wild he is, it can take a long while but it is so
worth it. When your little wild one lets you touch her, or better yet
*comes* to you to be pet, you know you're making progress.  Best of
luck, you are very lucky to be chosen by the wild one.

Cheryl

We found our feral at about 2 months old.  We fed her and visited her daily.
We would call out 'kitty' and she would cautiously come out from under the
shed to greet us.  After 3 weeks, she allowed us to pick her up.  We let her
in the house on occasion but always left the patio door open so she could
leave when she wanted to.  One night after she went back outside, we closed
up for the night but she literally climbed our patio screen trying to get
in.  We knew it was now time to adopt her.  We purchased all the necessary
goodies the next day, let her in the house and she has stayed in ever since.
She has battled tapeworms and roundworms, but is otherwise healthy.  Except
for the lump she received 3 weeks ago from her Nov 14th rabies vaccine
(please, I sure hope this isn't vaccine induced sarcoma!!!).  She has been
an absolute joy to be around ever since.  We did not declaw and she has the
run of the house.  Uses the scratching posts most of the time and has never
missed the litter box.  Granted, this kitten was younger than yours, but I
would bet it is possible.