Sea grapes

Sea Grapes (ウミブドウ, Umibudō) are sea creatures found in.

In
Upon donating the Sea Grapes to the Museum, it can be found in the large pool in the first room of the ocean exhibit, along with many other species of sea creatures. It is found in the corner of the pool nearest to the entrance. The exhibit has this to say about the Sea Grapes:

"Sea grapes are small spheres attached to slender stems on branches, similar to normal grapes. However, despite looking like and being called "grapes," they aren't much like the land-based variety. They grow in warm oceans and are very susceptible to cold conditions, meaning refrigeration is difficult."

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

"Sea grapes are a marine algae that look much like their landlocked namesake. That is, they are green pearl-like orbs that cluster tightly along underwater vines. And sea grapes, like regular grapes, are a popular snack food too...albeit of the saltier variety. Fans of the briny delicacy enjoy the way the shiny pearls POP when chewed. It makes one wonder whether sea grape juice might have some appeal? 'Twould leave the drinker with sour grapes, I suppose."