Sea creatures are collectable creatures in Animal Crossing: New Leaf and Animal Crossing: New Horizons that can be obtained by diving underwater while swimming. To catch any sea creatures, the player must have a Wet Suit, either purchased from Tortimer Island or rented from Lloid in New Leaf, or purchased from Nook's Cranny or the Nook Stop in New Horizons. Some sea creatures such as Octopus and Lobster were classified as fish prior to New Leaf.
Sea creatures, like fish, have a shadow that varies in size. Additionally, bubbles can be seen above a sea creature when swimming, and they may move slowly, quickly, erratically, or be completely stationary.
There are a total of 30 sea creatures in Animal Crossing: New Leaf, and 13 more were added in Animal Crossing: New Horizons, while three (the Ear Shell, Clam, and Horsehair Crab) were removed. While initially absent from Animal Crossing: New Horizons, sea creatures, along with swimming and Wet Suits, were added in the 1.3.0 Free Summer Update in July 2020.
Lists of sea creatures