All amphibian skin is poisonous to a degree. The major reason for this is to produce a bad taste to a potential predator. Some species of amphibians do have secretions that are toxic to humans and other animals, such as the poison dart frogs and other tropical frogs of the family Dendrobatidae. In North America the Cane Toad (or Giant Toad), Bufo marinus, and the Colorado River Toad, Bufo alvarius, produce toxins in its parotoid glands which can have harmful effects on humans and can kill cats or dogs that attempt to eat or chew on them. If you handle one of these toads wash your hands before touching anything that you may put in your mouth or before touching your eyes. In North America Bufo marinus is found in southernmost Florida (where it has been introduced), southern most Texas and eastern and western Mexico. It has also been introduced to Hawaii. Bufo alvarius is found mainly in southern Arizona and northeastern Mexico. Salamanders known as newts (Salamandridae) are also known to have toxic skin, with the Roughskin Newt, Taricha granulosa, being potentially dangerous to humans. This species is found along the west coast from Alaska to central California. Again, wash your hands after handling this species. In general, to be on the safe side, when handling amphibians you should always wash your hands before touching anything that you may put in your mouth or before touching your eyes.