endangered list (of species in North America) since May 1990, different projects are currently underway to restore the habitat of the Golden-Cheeked warbler. Efforts include The Safe Harbor agreement between Environmental Defense and the U.S. Fish and Wildlife Service, with the goal of rebuilding and creating new, safe habitats for the warbler (along with other endangered species). The Balcones Canyonlands Conservation Plan (BCCP) is another project responsible for building warbler preserves, with the goal of eventually adding a total of 41,000 acres to the warbler's habitat. These initiatives along with many others encourage landowners to learn more about the warbler (along with other species that inhabit their property) so local land owners may provide proper maintenance and protection of the warbler's habitat. A project that significantly aided habitat restoration for the warbler includes the U.S. Army's success at Fort Hood in protecting the largest patch of juniper-oak trees. Population The most serious problems that are facing the golden-cheeked warbler today are the habitats that are being lost and destroyed due to their limited and specific habitat requirements. Between the years of 1962 and 1974, the population estimated to an 8 to 12% drop. Based on intensive surveys and observations, it was counted that in 2015, there were 716 singing males within 39 acres in Texas. Threats The main direct threat towards the golden-cheeked warbler is the rapid loss of habitats. Their specific habitat needs place warblers at an extremely vulnerable position where urban development has taken a significant amount of the available habitat away. Over-browsing by white-tailed deer, goats, and other ungulates are also believed to be a source of habitat destruction, as they decrease the survival rate of seedling oaks and other deciduous trees, which are a key habitat for warblers. Furthermore, the brown-headed cowbird (which is a brood parasite that lays eggs in other nests, then abandons the nest) and its impact on the golden-cheeked warbler population is still being studied. As a result, the survivability of the young golden-cheeked warbler is significantly reduced. Ecology The golden-cheeked warbler breeds in the juniper-oak woodlands. The bird starts to build its nest about 16–23 feet in the air around the end of March out of ashe juniper bark. The male warbler will use song and physical abuse against other males to establish a territory in close proximity to the previous year's territory. Warblers will stay with only one mate for