Although no human death have been reported as resulting from a Theraphosidae bite, some genus may be classified as really dangerous for human. Efficiency of venom may not be related to aggressiveness. When looking at reports dealing with accidents inflicted to amateurs, an empirical classification may be compiled. An intense burning feeling covering all the thorax. Theraphosidae 's venoms seem to be less convulsing and tetanizing than other spiders, but it has more necrotic effects.
Symptoms are the same with birds.
However, an experience made with Pterinochilus murinus showed that its venom has similar effects compared to those resulting from Latrodectus mactans venom. The mouse 's death occurs after a period of great excitation, followed by tetanic convulsions, dyspnea, salivation and tear secretions, and signs of paralysis are noticed. A kidneys, liver, and brain examination shows a cellar degeneration. All this shows only a few species are dangerous for humans, and all still has to be discovered on this topic.