In Alberta, only the black widow spider is dangerous to people. Spiders play an important role in nature by keeping insect populations under control. Spiders bite their victims and kill them with poison. They then suck out the blood. After the blood is sucked out, the spider injects enzymes that turn the insides of the victim to liquid, which the spider then sucks up.
Spiders consume only liquids.
Some spiders lay only a few eggs, others lay several hundred. Shortly after mating, the male dies, and is sometimes eaten by the female. Many species take 2 or 3 years to mature.