The zoo in the northern city of Kushiro swapped an orangutan for a polar bear cub in January 2005, hoping it would eventually produce offspring with a female bear called Kurumi.

• 这家位于日本北部都市钏路的动物园2005年1月间用红毛猩猩交换了一头北极熊幼熊，希望牠最终能与名为核桃的母熊繁衍子嗣。