A pair of rare Amur tiger cubs are making their public debut at the Minnesota Zoo, raising hopes for preserving an endangered species that's native to far eastern Russia and northern China.

Como Zoo welcomed its first nyala calf, while last year, both a giraffe and snow leopard were born at the zoo. Two years ago, the Minnesota Zoo welcomed its own set of three Amur tiger cubs.

Four rare tiger cubs born at Longleat are doing well, with their personalities now beginning to develop, keepers say. The four-week-old cubs are Amur tigers, which are one of the most endangered ...