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The trails , with many ups and downs , are usually designated by letters and are marked every fifty meters with a sign giving the trail name and the distance in meters from the start of the trail . They are present in the Algerian desert where there is no vegetation and mid-day temperatures of 110o F. Freshwater snails can live in 122o F. water . Every bone represents exhausting hours of work to retrieve and process . The query parameters entered on the form are summarized in query language at the top of every result page . Every zipper is busted , the ripstop nylon ripped , and the weave of the fabric hidden beneath waxy globs of congealed fat and dried blood . He could identify the sounds of the more than 150 bird species in Golden Gate Park , and he knew and loved all of them . was able to drag in a horizontal direction along a smooth table twelve reels of cotton , a pair of scissors , a screwdriver , a key , and a knife , weighing in all no less than 17 oz . Because there are limited or no assurances concerning the accuracy of the data under these circumstances , appropriate annotations that the data were not audited would alert users of the reports to the limitations . Alternatively , if a locality was too imprecise to be usable at all ( " E Buttes " ) a permanent comment could be saved that made a note to that effect . All of the world 's ten most toxic snakes are elapids , and half of these are sea snakes . All plants with round leaves are not closely related . Venom proteins , after all , take energy to make . People tend to categorize snakes as either venomous or harmless , but , as colubrids demonstrate , the reality is a continuum , from completely harmless , to mildly venomous , to deadly . This process , which can be called retrospective georeferencing , is relatively new and to date there is no standardized way of doing it . Back then , Bandar was the only one who bothered to pick up the skeletons scattered on almost every Mexican beach . Use of these data in publications , dissertations & theses , or other scientific reports , should be accompanied by an acknowledgement of the Department of Ornithology & Mammalogy , California Academy of Sciences , as the source for the information .