There are at least five kinds of Brazilian wandering spiders, one of the world’s most dangerous arachnids. At best, their venom can seriously sting; at worst, it can kill. In the wild, wandering spiders forego webs or burrows. They patrol the forest floor and trees, looking for prey such as insects and small lizards. But they are also known for infesting banana plantations — so be careful if you see a spider peeking out from your bunch of bananas! They are not only extremely venomous but also very fast and aggressive, and won’t hesitate to bite! Here, a female wandering spider guards her egg sac.