Instinctive Drift
Despite their success, the Brelands discovered that animals sometimes failed to perform correctly and drifted or reverted to their instinctive behaviors. This phenomenon, called instinctive drift, interfered with training. The Brelands believed that understanding the animals' instincts was a necessary part of training.
Video: Patient like the Chipmunks by Bob and Marian Bailey, 1994. Edited for this exhibit.