glass snake
US /ˈɡlæs sneɪk/
UK /ˈɡlæs sneɪk/

1.
a legless lizard (genus Ophisaurus) with a very long, fragile tail that easily breaks off, found in North America, Europe, and Asia.
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The glass snake can detach its tail when threatened, a defense mechanism similar to other lizards.
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Despite its name, the glass snake is not a snake but a type of lizard.