Shell (Donkey Kong Country 3: Dixie Kong's Double Trouble!)
From the Super Mario Wiki
The Shell is one of the Brothers Bear items in Donkey Kong Country 3: Dixie Kong's Double Trouble!.
Barnacle is a seashell collector, but the Shell is missing from his collection. Dixie and Kiddy can purchase the Shell at Bazaar's General Store for five Bear Coins. According to Bazaar, the Shell is rare, and it originates from the ocean floor of Lake Orangatanga.
Back at his residence, Barnacle gives a Banana Bird to the Kongs in exchange for the Shell. The Shell is later seen on Barnacle's rack amongst his other seashells. This is not shown in the Game Boy Advance version.