There are several species of widow spiders in the United States, including the northern and southern black widow and the red widow. The brown widow spider is considered one of the least dangerous.

The following North American spiders may look dangerous but are generally harmless ... and Idaho and in parts of Montana, ...

What Is the Yellow Sac Spider? The yellow sac spider belongs to the family Clubionidae, a group of sac spiders. These nocturnal spiders get their name from the small sacs that they hide in ...