Snorkel

Snorkel is a dolphin that is trapped under the anchor of The Rusty Bucket in Rusty Bucket Bay. Banjo and Kazooie must swim into the boat via the hole the anchor comes out, leading into The Anchor Room. Defeat 5 Grille Chompas in the hallway, defeat 2 Seaman Grublins, and then press the Anchor Switch to raise the anchor. The player would then swim back out of the boat and to where Snorkel was to obtain a Jiggy. Strangely enough, after raising the anchor, Snorkel swims away; however, since The Rusty Bucket is in a closed harbor, it is unknown where Snorkel could have gone.

Trivia
Another interesting tidbit is that the water of Rusty Bucket Bay is so polluted that Banjo and Kazooie will drown quickly if they swim in it too long, yet Snorkel seems to tolerate the water just fine.