hemotoxin

Hemotoxins affect the blood or blood vessels: some destroy the lining of the smaller blood vessels and allow blood to seep into the tissues, producing local or widespread hemorrhages, while others render the blood less coagulable or cause abnormally rapid clotting, leading to circulatory collapse…

…speed, injecting its victim with hemotoxic venom that affects the red blood cells. The snake quickly releases the animal, waits a few minutes, then trails and consumes the dying creature. In winter black-tailed rattlesnakes hibernate individually in rock crevices, emerging on warm days to bask on rocks.