Japanese Spider Crab
One glimpse of its pincers will leave you quaking. That's because the Japanese spider crab's claws are enormous — not to mention strong and known to cause serious injury. The crab itself is gigantic, with a leg span that can reach 12 feet (4 meters) [source: ViralNova].
The spindly legged crustacean, discovered in 1836, resides deep down in the ocean, typically at depths of some 490 to 980 feet (149 to 299 meters). That makes it hard to snare the creatures — it's dark way down there! — and it doesn't help that its long legs enable it to quickly scurry away. Just one Japanese fishery has the mettle to harvest the wily crustaceans; in certain parts of Japan, spider crabs are considered a delicacy [source: ViralNova].
These creepy crabs will eat pretty much anything smaller than they are. They'll also use their food and their surroundings (e.g., sponges) to camouflage themselves from their predators, mainly octopi larger than they are. The crabs got their moniker from their lengthy gams, which cause them to resemble daddy longlegs arachnids. They're believed to have a lifespan of about 100 years [source: ViralNova].