When keller and marian breland, two psychologists who became animal trainers, decided that it would be cute to have a pig drop a big wooden coin into a box, they found?

When Keller Breland and his wife, Marian Breland Bailey (two psychologists who became animal trainers) decided that it would be cute to have a pig drop a big wooden coin into a box, they found out that the pig instinctually dropped the coin and began pushing it around with its nose, thus exemplifying indistinct drift.