https://www.ladybuglady.com/LadybugsFAQ.htmThis spider mimics a ladybug. By mimicking the ladybug, the edible spider is using this colour system to avoid predators.
Are ladybugs poisonous?
A. No. Ladybugs are not poisonous to humans. However, they can have toxic effects on some animals. Ladybugs have a foul odor which deters some predators from eating them and their bright colors also help as a deterrent. In nature, red and orange, are warning colors that indicate to another animal or insect that the potential "lunch item" might not be a good choice.