Katta-kun Monogatari  

The anime you are referring to is called "Katta-kun and Shu's War Adventure." It follows the story of Katta-kun, a real-life pelican who lived at Tokiwa Park in Ube. In this movie, Katta-kun befriends Shu, whose parents have gone to the Middle East for work. When war breaks out, they embark on a journey together to rescue Shus parents and end the conflict. Despite its absurdity, the anime has gained cult status in Japan due to its humor.