Dolphin

Dolphins are a species featured in the Banjo-Kazooie series.

Banjo-Kazooie
In Banjo-Kazooie, a dolphin named Snorkel can be found in Rusty Bucket Bay, trapped under the Rusty Bucket's anchor. When freed, he gives Banjo and Kazooie a Jiggy.

Banjo-Kazooie: Grunty's Revenge
In Banjo-Kazooie: Grunty's Revenge, two dolphins can be found throughout the game. One is in Breegull Beach, where he asks the duo's help to remove a Jiggy from the door of its house, as the golden jigsaw piece is blocking it.

The other dolphin is located at the Spiral Mere in Spiral Mountain. It asks for the bear and bird to feed it "ten of [its] favorite things", which turn out to be Blue Eggs. Once the eggs are fired in the dolphin's mouth in a mini-game where it keeps moving through five different spots, it will give the bear and bird a Jiggy.

Banjo-Pilot
In Banjo-Pilot, various dolphins can be seen jumping around the water in the background of Treasure Trove Cove. Additionally, one appears at the cerimony that happens when completing a Grand Prix alongside other characters, mostly from Banjo-Kazooie: Grunty's Revenge.