For Southern California wetlands threatened by sea level Endangered, threatened and near threatened birds that depend to varying degrees on the wetlands for survival include the California Ridgway s rail, the Savannah sparrow and the snowy plover Threatened Species Discovery Walk Hunter Wetlands Take a guided Threatened Species Discovery Walk and see how many animals and plants you can find Collect natural materials for Nature Weaving creations Feed the Magpie Geese meet some of our resident reptiles up close. Wetlands Threats, Maine Department of Environmental Sadly, wetlands are threatened by many human activities Since colonial times, over half of the wetlands in the lower states have been lost due to development, agriculture and silviculture, including % of Maine s wetlands. Wetland Functions and Values Rare, Threatened and In determining whether a wetland is significant for the Threatened and Endangered Species Habitat function, the Secretary or Panel shall consider whether a There is creditable documentation that the wetland provides important habitat for any species on the federal or state threatened or endangered species list of animals or plants b. What Threatens Wetlands A wetland that has been filled Purple Loosestrife Filling and draining are not the only threats to wetlands Exotic species also threaten many wetlands Exotic species are plants, animals, or insects that were accidentally or purposely introduced to an area they do not normally live in. Wiley Wetlands A Threatened Landscape Michael Williams Wetlands occupy some six per cent of the Earth s land surface They vary from fens and freshwater marshes to tropical mangroves and tundra swamps They perform vital hydrological, chemical and biological roles and contain unique and diverse forms of wildlife and habitat. Threats to wetlands University Of Montana Threats to wetlands Wetlands have been steadily and rapidly disappearing across the country since the beginning of European settlement Montana lost approximately % of its wetlands between the s and s See History of U.S Wetlands This is much lower than the national average.