The Brief Two Amur leopard cubs were born July 14 at Brookfield Zoo Chicago. Two Amur leopard cubs born at Brookfield Zoo Chicago are thriving at two months old, marking a major step for one of the world’s most endangered big cats. What we know:The cubs, born July 14, are the first litter for 6-year-old Mina, who arrived at Brookfield Zoo in 2021. With fewer than 100 Amur leopards left in the wild, their birth is considered a significant milestone in global conservation efforts. Only about 70 Amur leopards are in accredited zoos worldwide.