Nilgais were found in the north of Bangladesh until 1940s when they were last sighted in Tetulia and were declared extinct from this country.
Bantengs were found in the forests in Chittagong Hill-tracts region.
They were last sighted in the 1930s.
Wild Water Buffalo:
Wild water buffalos were once widely distributed in the south-western regions of Bangladesh.
Hunting and habitat loss caused them to become extinct during the early 1940s.
Indian peafowls were widely distributed at Shalban in Gazipur, in Madhupur, and in the north Bengal.
They also became extinct owing to loss of habitat during the early 1980s.
Pink Headed Duck:
Pink headed ducks were found in Bangladesh, India and Myanmar at the Teesta-Brahmaputra confluence until early 20th century when this species became globally extinct owing to hunting and loss of habitat.
Apart from these 13 species, some others are also afraid to have become extinct from Bangladesh.
These include Sloth Bears and White Winged Duck, which were found in the forests in Chittagong Hill-tracts region,
and Bengal Floricans, which were found in the north-eastern regions of Bangladesh in Sylhet and Mymensingh.