Acorn barnacle

The Acorn Barnacle is a type of sea creature in the introduced in.

While initially absent from, the Acorn Barnacle was added in the 1.3.0 Free Summer Update.

In
Upon donating an Acorn Barnacle to the museum, it can be found in the large pool in the first room of the Sea exhibit, along with many other species of sea creatures. It is found on the large rock. The exhibit has this to say about the Acorn Barnacle:

In
When donating to the museum, Blathers will say the following: