Crab spiders do not build webs. Some are wandering hunters and the most widely known are ambush predators. Some species sit on or beside flowers or fruit, where they grab visiting insects. — in Brazil. (spotted by Asergio.)
The Giant Coconut Crab (Birgus latro) is the largest terrestrial arthropod in the world. It is known for its ability to crack coconuts with its strong pincers in order to eat the contents. This crab is more than 3 feet from head to tail and weighs up to 40 pounds, with a pair of large pincers strong enough to open coconuts.