The redback spider (Latrodectus hasselti) hunts large creatures, including trapdoor spiders (Ctenizidae), king crickets (Anostostomatidae), and even small lizards. It will commonly steal prey off of other spiders' webs too. These spiders bite humans frequently, but only the females pose a serious threat. Female bites could lead to illnesses and even death in extreme cases.

The brown Widow (Latrodectus geometricus) is a lighter color with an orange hourglass shape on its abdomen, different from the black widow. They are known as "cobweb spiders" because they have an odd way of making webbing. Brown Widows have a toxic bite which is weaker in the males. It is said that brown Widows regularly fight for territory against black widows.

Within its silk-woven retreat, latrodectus mirabilis is recognized for its potent venom, which is a complex neurotoxin affecting the nervous system of smaller prey items, and occasionally deters larger predators. During its life cycle, this species exhibits sexual dimorphism; with mature females adorning a dimensional abdomen showcasing a striking hourglass marking, while males are markedly more diminutive and subdued in appearance. Latrodectus mirabilis adapts by strategically crafting irregular, scaffolded webs to ensnare unsuspecting insects.

Latrodectus tredecimguttatus is black in color, similar to most other widow species, and is identified by the thirteen spots which are found on its dorsal abdomen (the species name is Latin for "with thirteen spots"). These spots are usually red in colour, but may also be yellow or orange.The female of the species has a body length of about 7 - 15 mm, while the male is smaller and reaches 4 - 7 mm at best.

The western black widow (Latrodectus hesperus) is one of the few spider species that can harm humans. Pain from a bite can last up to twelve hours, but they do not bite unless provoked. The western black widow is also known for "sexual cannibalism." The female tend to eat the males after mating.

The northern black widow spider (Latrodectus variolus) matches other black widow spiders (Latrodectus) in appearance. The difference in this one is that the hourglass appears broken on the northern black widow spider. A bite is dangerous and can cause pain, rigid muscles, and vomiting. It is heavily suggested to seek out a doctor if bitten.

Distinguished by its striking red and black markings, katipo possesses a unique neurotoxic venom, which it uses to immobilize its prey, primarily small invertebrates. During its juvenile phase, its coloration differs vastly, displaying white, yellow, and orange marks that gradually darken as it matures. Preferring to dwell in sand dunes near the coast, this species has a specialized habitat preference, which is reflected in its careful selection of nesting sites that provide both shelter and ample hunting opportunities.

Adorned with a blend of hues forming cryptic patterns, phylloneta pictipes possesses the remarkable ability to fabricate intricate webs utilizing its silk, which exhibits exceptional strength and elasticity. Mainly nocturnal, this species employs a unique hunting strategy by relying on the vibrational cues transmitted through its web to detect and swiftly immobilize prey with a paralyzing bite before consumption.