Marijuana, the most often used illegal drug in this country, is a product of the hemp plant, Cannabis sativa. The main active chemical in marijuana, also present in other forms of cannabis, is THC (delta-9-tetrahydrocannabinol). Of the roughly 400 chemicals found in the cannabis plant, THC affects the brain the most.
Cats 'vibrate' when marking territory-spayed cats can also 'dry' spray. Spayed male cats urine doesn't smell. They swish their tales as a sign of annoyance or anger. If the tip of the tail 'trembles', it's quite often a sign of being 'unsure' about something. Source(s): Cat owner.
Rating Newest Oldest. Best Answer: There are numerous North American snakes which shake their tail if they feel threatened, most of which are harmless. Copperheads and cottonmouths are two venomous snakes which shake their tails like a rattlesnake. Some of the harmless snakes which do this are rat snakes and corn snakes, king snakes, gopher snakes and bull snakes, to name a few. Source(s): madsnakeman Â· 5 years ago.