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The mugger crocodile (Crocodylus palustris) is a medium-sized broad-snouted crocodile, also known as mugger and marsh crocodile. It is native to freshwater habitats from southern Iran to the Indian subcontinent, where it inhabits marshes, lakes, rivers and artificial ponds. It rarely reaches a body length of 5 m (16 ft 5 in) and is a powerful swimmer, but also walks on land in search of suitable waterbodies during the hot season. Both young and adult mugger crocodiles dig burrows to which they retreat when the ambient temperature drops below 5 °C (41 °F) or exceeds 38 °C (100 °F). Females dig holes in the sand as nesting sites and lay up to 46 eggs during the dry season. The sex of hatchlings depends on temperature during incubation. Both parents protect the young for up to one year. They feed on insects, and adults prey on fish, reptiles, birds and mammals. The mugger crocodile evolved at least 4.19 million years ago and has been a symbol for the fructifying and the destructive powers of the rivers since the Vedic period. It was first scientifically described in 1831 and is protected by law in Iran, India and Sri Lanka. Since 1982, it has been listed as Vulnerable on the IUCN Red List. Outside protected areas, it is threatened by conversion of natural habitats, gets entangled in fishing nets and is killed in human–wildlife conflict situations and in traffic accidents.
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 on the northwest coast lowland dry zone of Sri Lanka. The park is located 30 km (19 mi) west Anuradhapura and 26 km (16 mi) north of Puttalam (approximately 180 km (110 mi) north of Colombo). The park is 1,317 km2 (508 sq mi) (131, 693 hectares) and ranges from 0–152 m (0–499 ft) above sea level. Nearly one hundred and six lakes (Willu) and tanks are found spread throurature is about 27.2 °C (81.0 °F). Inter-monsoonal rains in March and the northeast monsoon (December – February) are the main sources of rainfall.ghout Wilpattu. The annual Rainfall is about 1,000 mm (39 in) and the annual temperature is about 27.2 °C (81.0 °F). Inter-monsoonal rains in March and the northeast monsoon (December – February) are the main sources of rainfall.