Ferret Brain (IMAGE) Howard Hughes Medical Institute Caption Ferrets have an outer brain layer that is large and folded -- similar to that of humans. A new genetically engineered ferret has a smaller brain (right 3-D rendering) than a normal ferret (left) and may offer clues about brain development in humans. Credit Walsh Lab/HHMI/Boston Children's Hospital Usage Restrictions Must use with credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.