Snake 'plays dead' by remaining completely still after realising

When approached in Texas, US, the snake began to squirm vigorously to get away but, realising it can
When approached in Texas, US, the snake began to squirm vigorously to get away but, realising it can't, it stopped dead, mouth gaping and contorts its neck to appear as if it is broken.

The Red-Bellied Snake Finger Lakes Land Trust

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In Defense of Snakes and Their Importance to Ecology

Northern copperhead Smithsonian's National Zoo and Conservation Biology Institute

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The Ultimate Hognose Snake Care Guide - The Critter Depot

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Copperhead snakes are out in the Mid-Atlantic and Southeast - The Washington Post