Stork

The Stork was given the assignment of delivering Baby Mario and Baby Luigi to the home of Mr. and Mrs. Mario in the Mushroom Kingdom during the events of Super Mario World 2: Yoshi's Island. However, he was attacked by Kamek, who wanted to kidnap the babies before they matured and doomed the future of the Koopas. However, only Baby Luigi was kidnapped. The other baby fell to the open sea. Soon afterwards, The Stork was kidnapped as well.

Fortunately, Baby Mario did not drown in the ocean; he actually fell on top of Yoshi. Using his instincts, Baby Mario tracked down the location of his brother. After Yoshi defeated Baby Bowser, Baby Luigi and The Stork are rescued. The Stork then carried out his assignment. Flying through the clouds and above the mountains, he eventually reaches the Mushroom Kingdom, and successfully delivers the babies to their parents.

In Yoshi's Island DS, The Stork appears helping the babies plus Baby Donkey Kong, Baby Peach, Baby Wario and Baby Bowser. It was a major character. Also in the end in the game it was revealed that The Stork is a species.