Abstract
When moving up or down a mountain from a given site, one encounters faunas that differ by varying degrees. The elevational separation between sites [Costa Rica to California, USA] obviously influences the magnitude of that difference (faunal similarity is inversely proportional to elevational separation); local environmental discontinuities, slope steepness and certain global factors may also affect these between-altitude faunal similarities. One possible global relationship, that of latitude and the extent of faunal similarity for reptilian [lizard and snake] and amphibian [frog] communities at different altitudes is examined.

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