Yellow Yoshi

Yellow Yoshi is the yellow member of Yoshi's species.

In canon
Yellow Yoshi first appears in Super Mario World, where he can be found in a Yoshi Egg in Star World. If he eats five enemies (or one power-up), he will turn into a fully-grown Yoshi. He acts the same as Green Yoshi except when he has any Koopa Troopa shell, where he can make big stomps which defeat enemies near him.

Yoshi's Return to Dinosaur Land
In Yoshi's Return to Dinosaur Land, Yellow Yoshi is one of the main characters. He acts as the fourth protagonist.