Why are most spiders and tarantulas non-aggressive?

If you mean non-aggressive towards humans, it's because they have nothing to gain by doing so. They can't kill us, in most cases, so what purpose would it serve to run around attacking us? All that would be likely to happen is the spider getting stomped, and that's bad for their health. read more

Care for tarantulas is relatively easy: Feed them once or twice a week depending on their hunger levels, keep humidity high in the cage (if a tropical species), and make sure that there are no crickets in the cage when the spider moults or else the cricket will kill the spider. read more