They can cause deep wounds. But they don't attack human beings. Their bite harms only certain small creatures. These include insects. Mice can be harmed by their bite too.
Tarantulas come out of their burrows ar dusk.
Dawn is the time of their return to their burrows. At night the mature males look for females. Sometimes they become intruders in people's homes. A fertilized female tarantula lays several hundred eggs at one time. Her next act is to weave a cocoon of silk to enclose them.