whip snake
US /ˈwɪp ˌsneɪk/
UK /ˈwɪp ˌsneɪk/

1.
a slender, fast-moving snake, typically of the genus Masticophis or Demansia, found in arid regions of North America and Australia.
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The desert hiker spotted a long, thin whip snake slithering across the sand.
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Despite its speed, the whip snake is generally harmless to humans.