1. Evolution of Venom: Both Black Widow and Redback spiders have evolved potent venom that is designed to immobilize their prey quickly. This venom contains a mix of neurotoxins and enzymes that break down the victim's tissues, allowing the spider to feed on the liquefied remains. 2.. Carnivorous, eating mostly insects. Average lifespan. Females between two and three years, males between six and seven months. Size. Females measure 1cm, males measuring between 3mm and 4mm. The redback spider has been a well-known member of Australia's most notorious species list for years, with very few locals unaware of its poisonous.
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However, one of the main differences is the fact that black widows have a dorsal red stripe, while the redback spider doesn't have this stripe. You can easily find this stripe by taking a closer look at the spider, which can help you distinguish between the two. 4. They have Similar Behaviors. Both black widow spiders and redback spiders are.. Latrodectus mactans is the most common species of black widow in North America. The female is shiny black and usually has a reddish to yellow hourglass design on the underside of the spherical abdomen. Sometimes two small triangles, instead of a complete hourglass, are present. The body is about 1 cm (about 0.4 inch) long.
