To the ancient Chinese, they were symbolic of evil and death. Tarantulas use blood pressure, as well as muscles, to move their legs. Water loss can be devastating to the spider because it lowers the animal's blood pressure, making it hard to walk. The most famous poisonous fish is the puffer, which has caused many human fatalities. It's considered a delicacy in Japan, but if prepared the wrong way, this fish can be deadly.
Most venomous snakes replace their fangs every few weeks.
Fangs wear out quickly, so up to six replacements are continually growing in each jaw. Not all venomous creatures deliver their poison by biting. An adult rattlesnake can rattle at a rate of 50 times per second. Sixty percent of all snakebites could be prevented by wearing boots that cover the ankle. The top 10 most venomous snakes in the world are the black mamba, death adder, green mamba, coral snake, taipan, tiger snake, common krait, cape cobra, king cobra and bushmaster.