11.   Left to their own devices, cats become nocturnal and secretive.

12.   Often, cats become overweight for the same reason that people do.

13.   Over thousands of years, cats have become quite successful in training humans -- to open doors for them, scratch them and feed them -- all on command.

14.   Taylor has found that the cats have become unexpected marketing assets.

15.   They also said that cat cloning may become important for the preservation of endangered species, although that would require using captive big cats as surrogates.

16.   While olfactory tractotomy is not to be considered lightly, there is one unexpected side effect that owners usually like - the cat becomes more affectionate.

17.   A small tabby cat has become the mascot for the gatekeeper.