I'm no expert, but this is my guess:
Birds don't fly when they are born, humans don't walk when they are born. But birds learn to fly and humans learn to walk unless something is wrong with there wings or legs.
But, there is also the cases that scientists believe people just don't know how to hear, see, or walk. It's rare and it's only a theory most of the time from what i've read.
So i guess it COULD be possible that something in there tail is wrong, or somehow they just don't have what it takes to figure it out using instincts.
Now that i type this, is it possible for something to loose, or just not have, instincts?
I'd say it's a possibility.