Since the start of the coronavirus outbreak in Ukraine, animals in Mykhailo Pinchuk's cash-strapped zoo have had to make do with leaner diets.
High-quality beef has been partially replaced by other meats, and broccoli swapped for cheaper cabbage.
Monkeys, lions and tigers have been surprised by the changes, and one of the leopards has visibly lost weight, zookeepers say.
"We are ashamed, and they are sad," Pinchuk, head of Ukraine's largest private zoo, told AFP.
