be renewable by 2030 and for all to be carbon-free by 2050. Ecosystem Forests cover 62% of Virginia , of which 80% is considered hardwood forest, meaning that trees in Virginia are primarily deciduous and broad-leaved. The other 20% is pine, with Loblolly and shortleaf pine dominating much of central and eastern Virginia. In the western and mountainous parts of the Commonwealth, oak and hickory are most common, while lower altitudes are more likely to have small but dense stands of moisture-loving hemlocks and mosses in abundance. Spongy moth infestations in oak trees and the blight in chestnut trees have decreased both of their numbers, leaving more room for hickory and invasive ailanthus trees. In the lowland tidewater and Piedmont, yellow pines tend to dominate, with bald cypress wetland forests in the Great Dismal and Nottoway swamps. Other common trees include red spruce, Atlantic White cedar, tulip-poplar, and the flowering dogwood, the state tree and flower, as well as willows, ashes, and laurels. Plants like milkweed, dandelions, daisies, ferns, and Virginia creeper, which is featured on the state flag, are also common. The Thompson Wildlife Area in Fauquier is known for having one of the largest populations of trillium wildflowers in all of North America. White-tailed deer, one of 75 mammal species found in Virginia, rebounded from an estimated population of as few as 25 thousand in the 1930s to over one million by the 2010s. Native carnivorans include black bears, who have a population of around five to six thousand in the state, as well as bobcats, coyotes, both gray and red foxes, raccoons, weasels and skunks. Rodents include groundhogs, nutria, beavers, both gray squirrels and fox squirrels, chipmunks, and Allegheny woodrats, while the seventeen bat species include brown bats and the Virginia big-eared bat, the state mammal. The Virginia opossum is also the only marsupial native to the United States and Canada, and the native Appalachian cottontail was recognized in 1992 as a distinct species of rabbit, one of three found in the state. Whales, dolphins, and porpoises have also been recorded in Virginia's coastal waters, with bottlenose dolphins being the most frequent aquatic mammals. Virginia's bird fauna consists of 422 counted species, of which 359 are regularly occurring, 41 are accidental (vagrant), 20 are hypothetical, and two are extinct; of the regularly occurring species, 214 have bred in Virginia, while the rest are winter residents or transients