They are usually brown, grey, black, or tan with darker markings such as stripes. This coloring helps them camouflage, allowing them to hide from predators and also prey so they can sneak up and attack.
They will bite when threatened however, while they are venomous, their bites will usually just cause a little redness and swelling to humans.
They eat mostly ground dwelling insects and other spiders, and tend to hunt on the ground. They hide in trees, leaf litter, animal burrows, and occasionally climb a tree.
Before mating, males get the attention of females by waving around and banging together their pedipalps, which are the small appendages near their mouth.
The females lay eggs, surround them in silk creating an egg sack, and then carry the eggs with them. They tend to exhibit aggression during this time.