Amphibian means "double life", referring to the fact that most adult amphibians live on land while embryos need water to survive. Some amphibians have existed since the Jurassic era; however, the number of these long-lived animals is declining worldwide (Amphibia). In 2010, 32% of the planet's 6,600 amphibian species were threatened with extinction (Hayes, Falso, Gallipeau, Stice 2010). There is no single cause for the decline of amphibians, but it appears that habitat loss, such as deforestation, is the main reason, alongside human impact in terms of urbanization, forest fragmentation , predation, human exploitation, pathogens and climate change (Hayes, Falso, Gallipeau, Stice 2010). Climate is decreasing amphibian numbers due to increased temperature, decreased precipitation, increased UV radiation levels, and increased pesticides. The decline in population rate is also a factor; there are more deaths and reduced birth rates among amphibians. The amphibian population decline was considered a global phenomenon in the early 1990s and some experts consider this decline to be Earth's sixth mass extinction (Hayes, Falso, Gallipeau, Stice 2010). One way to gather information on amphibian declines has been through the Global Amphibian Assessment or GAA. The GAA is the first ever global assessment of the conservation status of amphibians and takes into account all 5,743 known species worldwide, according to the GAA (AmphibiaTree). GAA results are published for public viewing on the Animal Specialty Group website. There is an assessment of amphibian decline, including Red List threat, regions and ranges of some amphibians, and general ecological information (AmphibiaTree). The GAA said in the middle of the document......2003. The effects of adjacent land use on wetland amphibian species richness and community composition. Canadian Journal of Fisheries and Aquatic Sciences, [cited November 30, 2011] 60(9), 1078-1094. Forman RTT, Alexander LE. 1998. Roads and their main ecological effects. Annual Revies, [cited December 2, 2011](29), 207-231. Available from: doi: 10.1146/annurev.ecolsys.29.1.207Leydig TF. 1992. Human impacts on genetic diversity in the forest ecosystem. Oikos, [cited December 1, 2011] (63), 87-108. Available at: http://www.fs.fed.us/psw/publications/ledig/captured/psw_1992_ledig037.pdfHayes TB, Case P, Chui S, Duc C, Haeffele C, Haston K, Tsui M. 2006. Pesticide Mixtures , endocrine disruption and amphibian decline: are we underestimating the impact? Environmental Health Perspectives, [cited December 2, 2011] 11440-50. Available from: doi:10.1289/ehp.8051