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THE ENVIRONMENT
The mean annual rainfall ranges from around 1 200 millimetres at Waglan Island to more than 3 000 millimetres in the vicinity of Tai Mo Shan. About 80 per cent of the rain falls between May and September. The wettest month is June, when rain occurs about two days out of three and the average monthly rainfall at the Royal Observatory is 431.8 millimetres. The driest month is December, when the monthly average is only 25.3 millimetres and rain falls on only about five days in the month. Climatological data is given in Appendix 39.
Severe weather phenomena that can affect Hong Kong include tropical cyclones, strong winter monsoon winds, and thunderstorms with associated squalls that are most frequent from April to September. Waterspouts and hailstorms occur infrequently, while snow and tornadoes are rare.
Wildlife
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The physical and climatic environment of Hong Kong create, in areas of natural and established woodlands, grass and scrub, habitats for a wide variety of native animal and plant life. Under pressure from the human population, it is now rare for the larger animal species to be seen, but reptiles and amphibians, birds, and many kinds of insects
are common.
Most of Hong Kong's countryside is protected by the Forests and Countryside Ordinance, the Wild Animals Protection Ordinance, the Country Parks Ordinance, and the Animals and Plants (Protection of Endangered Species) Ordinance.
One of the most important sites in Hong Kong for wildlife is the Mai Po Marshes. A restricted area under the Wild Animals Protection Ordinance, managed by the World Wildlife Fund, it is an internationally significant site for migratory and resident birdlife. Its 380 hectares of mudflats, shrimp ponds and dwarf mangroves provide a rich habitat, particularly for ducks and waders. More than 250 species of birds have been observed in this area, and at least 110 of them are rarely seen elsewhere in the territory.
Yim Tso Ha, also a restricted area, is the largest egretry in Hong Kong. Five species, the Chinese Pond Heron, Night Heron, Cattle Egret, Little Egret, and the rare Swinhoe's Egret, nest there regularly. More than 1 000 egrets can be found there between April and September, the nesting season. Another egretry near Mai Po is visited by most species but not the Swinhoe's Egret.
Although traditional fung shui woods near the old villages and temples are increasingly affected by development, they continue to provide a very important habitat for many birds. Sightings in wooded areas include an assortment of warblers, flycatchers, robins and bulbuls.
Of the larger indigenous animals, the Chinese pangolin (Scaly Anteater) which grows to a length of about one metre and is protected by horny scales, in still seen occasionally. Areas around the Kowloon reservoirs are inhabited by monkeys that originated from those that either were released or had escaped from captivity. There are breeding groups of both Long-tailed Macaques and Rhesus monkeys. Smaller mammals are common, with the Grey Shrew and the House Shrew being numerous in some rural areas. The Chinese Porcupine, with its strikingly coloured black and white quills, is still present in parts of the New Territories and Hong Kong Island.
Wild pigs were once sufficiently scarce to warrant protection by law, but their numbers have increased to such an extent that they occasionally damage crops, causing farmers to complain. Consequently, special culling exercises have been organised by the Royal Hong Kong Police Force to reduce this threat to crops.