Spiders are deadly poisonous.1. Black widow spider the male and female will look different is the female will have a length of 1-2 cm black belly is a nematode, striped red hourglass The black widow spider males. One is smaller than the female, about 20 times is brown, and no pattern hourglass stomach! With the male is smaller than the female. It can't bite people, so the black widow spider bite humans. It is female. Black widow spider venom, the toxic effect on the nervous system.
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