Pigeon Island National Park is one of the two marine national parks of Sri Lanka. The national park is situated 1 km off the coast of Nilaveli, a coastal town in Eastern Province, encompassing a total area of 471.429 hectares. The island's name derives from the Rock Pigeon which has colonized it. The national park contains some of the best remaining coral reefs of Sri Lanka. Pigeon Island was designated as a sanctuary in 1963. In 2003 it was redesignated as a national park. This national park is the 17th in Sri Lanka. The island was used as a shooting range during the colonial era. Pigeon Island is one of the several protected areas affected by the Indian Ocean tsunami in 2004.
In Sri Lanka ,The majority of species are found in the foothills (up to 3,000 feet (910 m) elevation). A much smaller number of species are found above 4,000 feet (1,200 m), while 20 species of butterfly are restricted to the low lying dry zone (below 500 feet (150 m) elevation). The number of butterflies peaks in two seasons during the year. The first of these is during the Southwestern monsoon in the months of March to April. The second is during the Northeastern monsoon which continues from September to October.
Wilpattu National Park (Willu-pattu; Land of Lakes) is a park located on the island of Sri Lanka. The unique feature of this park is the existence of "Willus" (Natural lakes) - Natural, sand-rimmed water basins or depressions that fill with rainwater. Located in the Northwest coast lowland dry zone of Sri Lanka. The park is located 30 km west Anuradhapura and located 26 km north of Puttalam (approximately 180 km north of Colombo). The park is 131, 693 hectares and ranges from 0 to 152 meters above sea level. Nearly sixty lakes (Willu) and tanks are found spread throughout Wilpattu. Wilpattu is the largest and one of the oldest National Parks in Sri Lanka. Wilpattu is among the top national parks world renowned for its Leopard population. The Leopard population in Wilpattu is still not yet known.