Hyppo and Thomas (1971 – 1972)

Hyppo and Thomas is an anime created by Tatsunoko Production. Thomas is a cunning bird who sponges on Kaba, the good-natured hippopotamus. Although Thomas is a dependent, living in Hyppo's big mouth, he always acts lordly and tries to outsmart his simpleminded host. However, their basic friendship and cooperation endures despite their frequent quarrels.