Vampire squids (such as this one photographed by the Monterey Bay Aquarium Research Institute) are cephalopods that technically fall somewhere between octopi and squids but belong to their own class, Vampyromorphida. They don't feed on blood, but they do have the vaguely disturbing habit of turning themselves inside out if threatened.
As a predator, the Humboldt squid can grab prey with a speed that observers have likened to lasers. They've also attacked the cameras and lights, and even the diving masks of humans trying to observe them.
Yes, there are squids that can fly, and not just for a few feet at a time, either. Think 30 meters at a time, using membranes similar to that of a flying squirrel. A very tentacled, very muscular, very wet flying squirrel.
This specimen was photographed flying about 100 nautical miles north of a remote group of volcanic islands in the South Atlantic Ocean.
This cute little Hawaiian bobtail squid can light up, but only because of a colony of parasites living inside of it.
The parasite, a bacteria called Vibrio fischeri, is fed a sugary solution by the squid. In turn, the light-up parasite acts almost like a camouflage, hiding a backlit squid from predators when viewed from below.
Let's ease you into giant squids by first showing you what they look like when they're young and (relatively?) cute. These young giant squids, about 5.5 inches each, were caught in the waters near the Japanese city of Hamada in 2013.
You're looking at two of the first three baby giant squid ever caught.
Giant squids live in a sea so deep that it's not even clear what else is down there. What we do know is this: They can grow up to 40 feet. The only predators big enough to eat the adults are sperm and pilot whales.
Not even a deep-sea shark is brave enough to take on a full-grown giant squid.
That headline up there? Not a hyperbole. Giant squids essentially shred their prey before the unlucky victims even reach the esophagus. How? Two tentacles grip a deep-sea fish, pulling it toward the squid's beak.