and highways. There are seven regional transport offices namely: Coimbatore South (Peelamedu), Coimbatore Central (Gandhipuram),Coimbatore North (Thudiyalur), Coimbatore West (Kovaipudur), Mettupalayam, Pollachi and Sulur. There are five National Highways that connects the district to other parts of the states: Town buses serve most parts of intra-city routes as well as other towns and villages in the district. Buses also connect the district with all major towns in Tamil Nadu, Kerala, Karnataka, Puducherry and Andhra Pradesh. The number of inter-city routes operated by Coimbatore division is 119 with a fleet of more than 500 buses. It also operates town buses on 257 intra-city routes. Flora and fauna Coimbatore district is home to the Anaimalai Wildlife Sanctuary and National Park. The park and sanctuary are the core of the Nilgiri Biosphere Reserve and is under consideration by UNESCO as part of the Western Ghats World Heritage Site. The park is home to a wide variety of flora and fauna typical of the South Western Ghats. There are over 2000 species plants of which about 400 species are of prime medicinal value. The animals in the park include tiger, leopard, sloth bear, elephant, Indian giant flying squirrel. The birds endemic to the Western Ghats residing here include Nilgiri wood pigeon, Nilgiri pipit, Nilgiri flycatcher, Malabar grey hornbill, spot-billed pelican etc. The Amaravathi reservoir and the Amaravathi river are breeding grounds for the mugger crocodiles. Economy Coimbatore district houses more than 25,000 small, medium and large industries with primary industries being engineering and textiles. Coimbatore is called the "Manchester of South India" due to its extensive textile industry, fed by the surrounding cotton fields. The city has two special economic zones (SEZ), the Coimbatore Hi-Tech Infrastructure (CHIL) SEZ at Saravanampatti and the TIDEL Park near Peelamedu, and at least five more SEZs are in the pipeline. As of 2006–07, before the bifurcation of Tirupur district, Coimbatore was the highest revenue earning district in Tamil Nadu. In 2010, Coimbatore ranked 15th in the list of most competitive (by business environment) Indian cities. Coimbatore region experienced a textile boom in the 1920s and 1930s. Though, Robert Stanes had established Coimbatore's first textile mills as early as the late 19th century, it was during this period that Coimbatore emerged as a prominent industrial center. Coimbatore has trade associations such as CODISSIA, COINDIA, SITRA and COJEWEL representing industries in the city. Coimbatore also has a trade fair ground,