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The fauna of Scotland is generally typical of the north-west European part of the Palearctic ecozone, although several of the country's larger mammals were hunted to extinction in historic times and human activity has also led to various species of wildlife being introduced. Scotland's diverse temperate environments support 62 species of wild mammals, including a population of Wild Cats, important numbers of Grey and Harbour Seals and the most northerly colony of Bottlenose Dolphins in the world. Many populations of moorland birds, including Blackcock and the Red Grouse, live here, and the country has internationally significant nesting grounds for seabirds such as the Northern Gannet. The Golden Eagle has become a national icon, and White-tailed Eagles and Ospreys have recently re-colonised the land. The Scottish Crossbill is the only endemic vertebrate species in the British Isles. Scotland's seas are among the most biologically productive in the world; it is estimated that the total number of Scottish marine species exceeds 40,000. An estimated 14,000 species of insect, including rare bees and butterflies protected by conservation action plans, inhabit Scotland. Conservation agencies in the UK are concerned that climate change, especially its potential effects on mountain plateaus and marine life, threaten much of the fauna of Scotland.