When my cousin and I visited the park in '94, we thought the Polar Bear was acting strange: swimming a repetitive triangle in its pool, always pushing off exactly the same way, etc.

Fast forward a month or two, and I'm home in SFO reading an NYTimes article in which the Central Park zoologists have decided the Polar Bear was "neurotic" because it had nothing to do. It was even fed every day at the same time, in the same place. Duh! Seems they started varying the feeding times & locations - made the bear "hunt" for its food - and it started acting like a "normal" bear again, more or less!