Coral snake - 2 to 5 ft. long, in Americas south of Canada; bite may be painless; slow onset of paralysis, impaired breathing; mortalities rare, but high without antivenom and mechanical respiration.
Rattlesnake - 2 to 6 ft. long, throughout W. Hemisphere. Rapid onset of severe pain, swelling; mortality low, but amputation of affected digits is sometimes necessary; antivenom. Mojave rattler may produce temporary paralysis.
Cottonmouth water moccasin - up to 5 ft. long, wetlands of southern U.S. from Virginia to Texas.
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