Keelback snakes have glands that secrete poison they ingest from eating poisonous toads. Poison hemlock contains traces of other similarly poisonous alkaloids. Botulinum toxin is the most poisonous substance known. These natural toxins include some of the most poisonous compounds known. Many battery chemicals are corrosive, poisonous or both. It is very poisonous, corrosive, and flammable. A snake representing a penis is alive, dangerous, perhaps poisonous and slimy. Lotito claimed not to suffer ill effects from his consumption of substances typically considered poisonous. Oleander is one of the most poisonous commonly grown garden plants. Brucine is not as poisonous as strychnine. Many of these poisonous compounds also have important medicinal benefits. This species is very similar in appearance to the poisonous water hemlock. A number of other plants (often poisonous, medicinal and/or psychoactive) are associated with Hecate. It is used to control the release of poisonous gases over the Island. This is a compendium of poisonous fungi.