Primates

Primates  also flourish all over Bangladesh, but most profusely in the Sundarbans and the Hill Tracts.

Deer

The Chital (spotted deer) is also very regular om the forests of the Sundarban. The Chital is possibly the most beautiful of all deer. Its skin is bright rufous-fawn generously spotted with white at all ages and all seasons. They are seen in herds of 10-30, which contains 2-3 stags. They are seen in grassy forest glades, forest edges, wood and cool streams in moist and dry deciduous forests upto 1000 m .

Average height is 36 in. (90 cm.) and weighs about 190 lb. (85 kg.)

Darters

Order: Pelecaniformes. Family: Anhingidae

Darters are normally referred to as "snake-birds" since of their long thin neck, which gives a snake-like form when they swim with their bodies submerged. The males have black and dark brown plumage, an erectile crest on the nape and a better bill than the female. The females have a much paler plumage mainly on the neck and underparts. The darters have totally webbed feet, and their legs are short and set far back on the body. Their plumage is somewhat permeable, like that of cormorants, and they broaden their wings to dry after headfirst. There are 4 species worldwide and 1 species which occurs in Bangladesh.

Swifts

Order: Apodiformes. Family: Apodidae

Swifts are tiny aerial birds, spend the majority of their lives rapid. These birds have very short legs and never reconcile voluntarily on the ground, perching instead only on upright surfaces. Many swifts have extensive swept-back wings that be like a crescent or a boomerang. There are 98 species worldwide and 6 group which occur in Bangladesh.

Terns

Order: Charadriiformes. Family: Sternidae

Terns are a set of generally universal medium to large sea-birds naturally with grey or white plumage, often with black markings on the head. Most terns hunt fish by headlong but some pick insect off the surface of clean water. Terns are normally long-lived birds, with some species now well-known to live in excess of 25 to 30 years. There are 44 species worldwide .