Tigress gives birth to 2 rare Sumatran cubs at US zoo, video viral

United States' Memphis Zoo has welcomed two critically endangered Sumatran cubs earlier in May. The zoo reported that Dari, a 7-year-old female Sumatran tiger, and Gusti, a 4-year-old male tiger, became parents to two cubs for the first time. The last time Memphis Zoo had tiger cubs was over 25 years ago, in April of 1998.