Something gory from our backyard – a California Striped Racer (Coluber lateralis lateralis) caught a lizard. The lizard of course dropped/lost its tail (a normal defense mechanism) and the snake had a pretty good grip on it, but the lizard was still pretty alive, writhing and fighting as much as possible. When the snake tried to get the lizard re-aligned towards its mouth in order to swallow it, the lizard got away. Good for the lizard (its tail will grow back), bad for the snake. Maybe the lizard was just too big for the snake to swallow.
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