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Most of the information in this table has been verified against the original publication in which each name was proposed . LD-50s have been measured for many species of venomous snakes ; the results are posted and regularly updated on the International Venom and Toxin Database ( http://www.uq.edu.au/~ddbfry/ind ex.html ) . This process , which can be called retrospective georeferencing , is relatively new and to date there is no standardized way of doing it . Accounting information called for in this standard provides the basis for evaluating program performance by comparing actual accounting data with estimated budget data for direct loans and loan guarantees . The operculate snails , in spite of the protection which their operculum may be supposed to afford , are exceedingly sensitive to cold . Relatively high costs of achieving or sustaining repayment agreements could suggest employing more aggressive collection tools sooner . This species is Myanmar 's most dangerous snake-it kills more than 1,000 Burmese a year-yet our guides snag them with homemade tongs , made by connecting two flimsy bamboo rods . This family contains approximately 64 percent of the more than 2,500 snake species and includes such familiar and harmless ones as garter snakes , gopher snakes , racers , and rat snakes . Working in Arctic frequently requires living in isolated tent camps up to 300 miles away from any supply base , so doing research there happily leads not only to novel scientific discoveries but to adventures as well . This list is preliminary ; we anticipate the addition of many new species , both species new to science and species new for Myanmar . The American fauna is relatively well known but little recent attention has been focussed on the Afrotropical fauna . Relatively inexpensive and powerful mapping software has been available for several years .