A tiger swims in its enclosure in Bangladesh's National Zoo in Dhaka, Bangladesh, March 2, 2020. (Str/Xinhua)

Deer are seen in Bangladesh's National Zoo in Dhaka, Bangladesh, March 2, 2020. (Str/Xinhua)

Zebras are seen in Bangladesh's National Zoo in Dhaka, Bangladesh, March 2, 2020. (Str/Xinhua)

A zookeeper feeds a hippo in Bangladesh's National Zoo in Dhaka, Bangladesh, March 2, 2020. (Str/Xinhua)