`` Taricha '' newts of western North America are particularly toxic . The rough-skinned newt `` Taricha granulosa '' of the Pacific Northwest produces more than enough tetrodotoxin to kill an adult human , and some Native Americans of the Pacific Northwest used the toxin to poison their enemies .
`` Taricha '' newts of western North America are particularly toxic ; the Rough-skinned newt `` Taricha granulosa '' of the Pacific Northwest produces more than enough tetrodotoxin to kill an adult human .