Pearl oyster

In New Leaf
Pearl oysters are also now found by diving, instead of being found on the beach, and are now a type of deep sea creature. Upon being donated to the Museum, it can be found sitting in the large tank in the first room of the ocean exhibit. The exhibit says this about the Pearl Oyster:

"Pearls are formed when mostly calcium carbonate and protein envelop foreign substances. Pearl oysters have numerous threadlike feet sticking out from their shell opening. These allow them to latch onto surrounding rocks and are actually surprisingly strong. Their adductor muscles are edible and are considered a delicious ingredient in some foods."