entire county. Flora and fauna Donegal has a wide variety of habitats, and over half of Ireland's plant and animal species can be found within the county. Approximately 11.4 per cent of the county is covered in forest, which is about average nationally. Forest cover is not evenly spread across the county and some areas, such as Pettigo and around Lough Derg, are very heavily forested, while more exposed coastal and upland areas are virtually barren. Around 65 per cent of Donegal's forests are publicly owned. The typical native tree species found in Donegal are Scots pine, aspen poplar, birch, hazel and oak. Other common trees include Sitka spruce, mountain ash, sycamore, European larch and horse-chestnut. Many species of terrestrial and flying mammals live in the county, including Irish hares, brown hares, red deer, sika deer, Irish bats, common pipistrelle bats, soprano pipistrelle bats, brown long-eared bats, whiskered bats, Daubenton's bats, Natterer's bats, American mink, pygmy shrews, rabbits, pine martens, stoats, badgers, red squirrels, gray squirrels, wood mice, house mice, brown rats, otters, red foxes, hedgehogs and feral goats. Marine mammals include harbour seals, grey seals, humpback whales, orcas, pilot whales, fin whales, minke whales, sperm whales, Cuvier's beaked whales, common dolphins, bottlenose dolphins, Atlantic white-sided dolphins, white-beaked dolphins, striped dolphins, Risso's dolphins and (very rarely) walruses. Notable bird species include barnacle geese, corn crakes, northern lapwings (Ireland's national bird), grey herons, Long-eared owls, golden eagles, barn owls, yellowhammers, storm petrels, Arctic skuas, wrens, golfinches, Atlantic puffins, razorbills, ravens, curlews and redshanks. Despite its northerly latitude and geographic isolation, Donegal also hosts two species of amphibian (common frog & smooth newt) and two reptile species (Leatherback turtle & viviparous lizard). The native Irish red deer in Donegal went extinct around 1860 and were re-introduced in the 1890s. Due to interbreeding, most of the deer in the county are now a Sika-Red deer hybrid. The Wild Ireland wildlife park near Burnfoot showcases some of Donegal's historic animal species that were hunted to extinction, including brown bears, lynxes and gray wolves. In 2001, the golden eagle was re-introduced into Glenveagh National Park and is currently Ireland's only breeding population. A survey of the macroscopic marine algae of County Donegal was published in 2003. The survey was compiled using the algal records held in the herbaria of the following institutions: the Ulster Museum, Belfast; Trinity College Dublin; NUI Galway, and the Natural History