grass snake
US /ɡræs sneɪk/
UK /ɡræs sneɪk/

1.
a common non-venomous snake (Natrix natrix) found in Europe and Asia, typically green or brownish with a yellow collar, that often lives near water and feeds on amphibians and fish
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We saw a grass snake basking in the sun by the pond.
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The grass snake is a protected species in many regions.