When Do Feral Mother Cat Left Her Kitten In My House?

When did the mother cat leave its kitten? The poor little thing looked so sad. I can’t believe she left her baby in my house alone! It’s already cold outside, and this poor kitty is just a tiny thing without it’s mama to keep warm! Please help me get that kitty out of here before it gets too cold for them both.

http://answers.yahoo.com//question/index?qid=20071029184627AA7aHG7

What are feral cats like when they come into your house or go out on the street?