| Date Added+- | Common Name+- | Classification+- | Min Age+- | Max Age+- | Collector | Media+- | Options |
| 30 Jan 12 | Hooded Seal | Carnivora Caniformia Phocidae Cystophora cristata | Sub Adult | Sub Adult | New England Aquarium | 1210 | ViewView Wall |
| 8 Feb 12 | Grey Seal | Carnivora Caniformia Phocidae Halichoerus grypus | Juvenile | Juvenile | New England Aquarium | 1531 | ViewView Wall |
| 20 Aug 12 | Short Beaked Common Dolphin | Cetacea Odontoceti Delphinidae Delphinus delphis | Adult | Adult | New England Aquarium | 1715 | ViewView Wall |