I'm for the Hippopotamus (1979)

In Africa, Slim and Tom are outraged when a ruthless German dictator begins auctioning off the continent's wildlife to zoos in Canada. Determined to put an end to this exploitation, the duo devises a plan to confront the tyrant and his henchmen. With a mix of humor and action, Slim and Tom embark on a mission to teach the villain a lesson he won't forget, fighting to protect their beloved animals and restore balance to their homeland.