Pigeons prefer to switch up the way they perform useful behaviours.

Researchers know that rewarding a behaviour makes it more frequent, and they assumed it also makes behaviours more consistent. But they tried it with pigeons, and pigeons prefer to do the rewarded behaviour in lots of different ways. They like changing up their strategy for getting treats.

They think this might not be unique to pigeons, so they're gonna try it with some other animals next.

Speaking anecdotally, I prefer to use a variety of different Go openings over the same one again and again.