Biodiversity of Assam plain.

1. Assam is one of the richest biodiversity zones in the world. It has tropical rainforests, deciduous forests, river line grasslands, bamboo orchards and numerous wetland ecosystems. Many of them are protected as national parks and reserved forests.
2. The Kaziranga National Park for Indian Rhinoceros is a 'World Heritage Site' in Assam.
3. Assam is the last refuge for many endangered species like the Golden Langur, Wood Duck, Bengal florican (also calledBengal Bustard) and Pygmy hog. Some other endangered species such as Tiger, elephant and Gibbon have significant population in Assam.
4. The white winged Wood Duck is the 'State Bird' of Assam. The state has the highest diversity of birds in India. Its mammal diversity is also high. It has the largest number of the Wild Water Buffalo in the world. It is also known for orchids.