reduction of farmland has resulted in reduced environment for, and resulted in a decline in numbers of various shrubland birds, including the American woodcock, brown thrasher, eastern towhee, willow flycatcher, golden-winged warbler, blue-winged warbler, field sparrow, and Baltimore oriole. Ospreys, whose eggs were previously damaged by DDT, began to reappear in 1998 and by 2010 were no longer endangered in the state. Several species have declined or disappeared from the state, including bats, many of which have been killed by white-nose syndrome, the New England cottontail, out-competed by the eastern cottontail rabbit, and the yellow-banded bumblebee, gone as one of 19 species of bee in decline. Invasive species and organisms include the Asian spotted-wing drosophila, a destroyer of crops, and eastern equine encephalitis virus whose antibodies were found in moose or deer in each of Vermont's counties. Flora Vermont is in the temperate broadleaf and mixed forests biome. Much of the state, in particular the Green Mountains, is covered by the conifers and northern hardwoods of the New England-Acadian forests. The western border with New York and the area around Lake Champlain lies within the Eastern Great Lakes lowland forests. The southwest corner of the state and parts of the Connecticut River are covered by northeastern coastal forests of mixed oak. Invasive wild honeysuckle has been deemed a threat to the state's forests, native species of plants, and wildlife. Many of Vermont's rivers, including the Winooski River, have been subjected to man-made barriers to prevent flooding. Climate change appears to be affecting the maple sugar industry. Sugar maples have been subject to stress by acid rain, asian longhorn beetles, and pear thrips. In 2011, the deer herd had grown too large for habitat, and many resorted to eating bark to survive the winter, destroying trees in the process. In addition, the sugar maples need a certain period of cold to produce sap for maple syrup. The time to tap these trees has shrunk to one week in some years. The tree may be replaced by the more aggressive Norway maples, in effect forcing the sugar maples to "migrate" north to Canada. Demographics Population According to the United States Census Bureau, the state of Vermont had a population of 643,503 in the 2020 U.S. census. At the July 1, 2019 Population Estimates Program, Vermont had an estimated population of 623,989. This included a natural increase of 3,178 (31,716 births minus 28,538