BanglaCapsule | Bangladesh National Zoo Timeline  

1950 Agricultural cooperation and aid ministry officially declared to establish a zoo in Dhaka. The zoo opened that time near Dhaka high court with several spotted deer, monkey and elephant.
Google
1950 The agricultural, cooperation and aid ministry officially declared to establish a zoo in Dhaka. Hence, the zoo started at that time at Segunbagicha, near the High Court of Dhaka with several spotted deer, peacocks, monkey and elephant.
Google
1974 Dhaka Zoo, the largest zoo in Bangladesh located in Mirpur, ceremonially opened for public.
Google
2015 Dhaka Zoo was renamed to Bangladesh National Zoo.
Google