no
Spiders aren't poisonous, they're venomous.
Red-backed Salamanders eat small arthropods, including insects and Spiders
Two poisonous spiders found in Australia are the Redback spider (Latrodectus hasseltii) and the Funnel-web spider (Atrax and Hadronyche species). Both spiders can deliver a potentially dangerous venomous bite to humans.
Black widows sometimes have spots of red on the back.
Red-backed Salamanders eat small arthropods, including insects and Spiders
All spiders, technically, are poisonous, but I do not believe barn spiders are dangerously poisonous.
All spiders are poisonous; some venoms just have no or little discernible effect on humans. Color is not necessarily an indication of toxicity. Some spiders are red to blend in with their surroundings, some are red as a warning, and really are venomous, and some a red to mimic the truly venomous ones. In any case, color alone is not enough to determine how poisonous a spider is.
Yes, some striped spiders are poisonous.
yes it means the poisonous spider
While there are many poisonous spiders, the only spider considered highly dangerous is the Red-Back.
yes, there are poisonous spiders everywhere.