Where did the cat go?

My aunt’s neighbor in New York had a beautiful black cat, Felix, who spent
his days outside and came indoors at night.
    One cool October evening, he disappeared. The neighbor searched for him
in vain for several days. The following spring, however, Felix reappeared,
looking healthy and clean. She figured he’s been out sowing his wild oats.
    Everything was back to normal until that autumn, when Felix disappeared
again.  The next spring, he returned. Perplexed, my aunt’s friend began
asking neighbors for clues.
    Finally, she rang the bell of an older couple who lived down the
street.  “A black cat?” the woman said. “Oh, yes! My husband and I hated to
see him out in the cold, so we bought a cat carrier. We take him to Florida
with us every winter.”
http://www.butlerwebs.com/animals/cats.htm