Yoshi Helicopter

From the Super Mario Wiki

A Yoshi Helicopter (sometimes known as the Yoshi-Copter) is a form Yoshi can become in Super Mario World 2: Yoshi's Island. Yoshi has to touch a Morph Bubble with a helicopter inside of it to become a helicopter. In this from Yoshi can fly around the level until he reaches the Yoshi Block or until his time as a helicopter runs out. The form returned in Yoshi's Island DS. In Mario Kart: Double Dash, a Yoshi Helicopter appeared in Baby Park and Yoshi Circuit, however it was not a form, it was an actual vehicle.

The morph bubble in Yoshi's Island DS.

An Orange Yoshi after getting the Morph Bubble.

Morph Bubble Vehicles
Yoshi Car · Yoshi Helicopter · Yoshi Mole Tank · Yoshi Submarine · Yoshi Train

Aircraft
Airship | Airship Fortress | Blade | Cheep-Cheep Blimp | Dragoon | Flying Krock | Funky Barrel | Gyrocopter | Hocotate Ship | Jumbo Barrel | King Kruiser II | Koopa Clown Car | Magic Carpet | Monster Mixer | Peach's Plane | Plane | Rainbow Ship | S.S. Brass | Sky Pop | Star Cruiser | Steam Cloud Balloon | Subspace Gunship | Trash Smasher | Treasure Ship | Yoshi Helicopter