Birds find their way home

This reminds me of something that happened when I was a child,we had a cat named Sam that got away from my mother at the animal clinic which was about 10 kilometres or more from where we lived.We though we might never see the cat again even though my mother went down every day and put out food and the people ate the clinic watched for him and said that he might come out at someones house near by if they happen to be out barbecuing but about 4 days later my father went down one morning and the cat was on our door step.It's amazing how animals seem to know the direction to get home even when they are dumped far away.