These picturesque geographical feature's boundaries delineat a low lying plain of about 47,570 sq. km. criss-crossed by innumerable brooks, rivulets and streams and rivers like the Padma[Ganges],the Megna,the Karnaphuli. Description : Physiography is the science which treats the Earth's exterior physical features, climate, life and the physical movements or changes on the Earth's surface, such as the currents of the atmosphere and ocean, the secular variations in heat, moisture,magnetism, i. e. physical geography. Sunderban is the most preciouse and wealthy area tor Bangladesn. nerban suituated in Khulna Division and it's gives protection to Bangladesh from outside enemies. There lives lot of different kinds of animals and these animals make our Sunderban beautiful and welthy. Mammals are a clade of endothermic amniotes. Among the features that distinguish them from the other amniotes, the reptiles and the birds, are hair, three middle ear bones, mammary glands infemales, and a neocortex (a region of the brain). The mammalian brain regulates body temperature and the circulatory system, including the four- chambered heart.
The mammals include the largest animals on the planet, the rorqual whales, as well as some of the most intelligent, such as elephants, some primates and some cetaceans. The basic body type is a four-legged land-borne animal, but some mammals are adapted for life at sea, in the air, in the trees, or on two legs. The largest group of mammals, the placentals, have a placenta which feeds the offspring during pregnancy. Mammals range in size from the 30-40 mm (1. 2-1. 6 in) bumblebee bat to the 33-meter (108 ft) blue whale.
Birds (class Aves or clade Avialae) are feathered, winged, bipedal, endothermic warm-blooded), egg-laying, vertebrate animals. With around 10,000 living species, they are the most speciose class of tetrapod vertebrates. All present species belong to the subclass Neornithes, and inhabit ecosystems across the globe, from the Arctic to the Antarctic. Extant birds range in size from the 5 cm (2 in) Bee Hummingbird to the 2. 75 m (9 ft) Ostrich. The fossil record indicates that birds emerged within theropod dinosaurs during the Jurassic period, around 150 million years ago.
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Birds are the only members of the clade originating with the earliest dinosaurs to have urvived the Cretaceous-Paleogene extinction event 66 million years ago. Modern birds are characterised by feathers, a beak with no teeth, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a lightweight but strong skeleton. All living species of birds have wings; the most recent species without wings was the moa, which is generally considered to have become extinct in the 16th century. Wings are evolved forelimbs, and most bird species can fly.
Flightless birds include ratites, penguins, and a number of diverse endemic island species. Some pecies of birds, particularly penguins and members of the Anatidae family, are adapted to swim. Birds also have unique digestive and respiratory systems that are highly adapted for flight. Some birds, especially corvids and parrots, are among the most intelligent animal species; a number of bird species have been observed manufacturing and using tools, and many social species exhibit cultural transmission of knowledge across generations.
Some marine reptiles, such as ichthyosaurs and mosasaurs, rarely ventured onto land and gave birth in the water. Others, such as sea turtles and saltwater crocodiles, eturn to shore to lay their eggs. Some marine reptiles also occasionally rest and bask on land. Tigers in Bangladesh are now relegated to the forests of the Sundarbans and the Chittagong Hill Tracts. The Chittagong forest is contiguous with tiger habitat in India and Myanmar, but the tiger population is ot unknown status.
In another study, home ranges of adult female tigers were recorded comprising between 12 and 14 km2 (4. 6 and 5. 4 sq mi). , which would indicate an approximate carrying capacity of 150 adult females. The small home range of adult female tigers (and consequent high density f tigers) in this habitat type relative to other areas may be related to both the high density of prey and the small size of the Sundarbans tigers. Present Condition Of Bangladesh : In present time Bangladesh environmental situation is in big risk.
Lot of disaster were happened in past and present time also running. our animals are also in big risk due to people are destroying trees and lands for making dewellings and mutistoried commercial complexes. For these reasons our animals are losing their foods and living places for survive. How Can We Protect Our Wild Life : To save our wild life we have to take lot of steps to and to take care of them and we have to deocrate our environment to make survival of our wilf life.
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