Spider Crabs are not exactly hunters, but these crabs have been known to eat algae, kelp, mollusks, slow-moving invertebrates, and the dead bodies of any creatures that happen to be floating around. In fact, this last option seems to be their favorite, as they seem to prefer to scavenge dead flesh rather than kill things themselves. Ancient mariner legends tell that these crabs used to actually drag sailors overboard and eat them alive in the depths of the ocean. While this is pretty unlikely, it is probably true that these crabs would enjoy the opportunity to pick apart the occasional dead sailor who had washed overboard

The goblin shark has a huge range that includes much of the Atlantic, Pacific, and Indian Oceans, but it's most commonly encountered off the coasts of Japan. Japanese fishermen who accidentally caught the sharks couldn't help but notice their protruding snouts, which reminded them of folk stories about a long-nosed, red-faced demon known as the tengu. So they began calling the species tengu-zame. (Zame means "shark" in Japanese.) This was translated into English as "goblin shark," with "elfin shark" being an alternative name the creature occasionally goes by

Pacific Blackdragons feed on bioluminescent creatures. Once inside the stomach these creatures can emit light that can actually pass through the stomach wall. The black tissue lining inside the stomach of the female Pacific Blackdragons prevents this from happening, thus sealing off all possible lights that can possibly warn a potential prey.

Glaucus atlanticus belongs to the order Nudibranchia and is known as the blue dragon, the blue sea slug, the blue angel, or the sea swallow. It has some interesting features and behavior, even compared to other sea slugs. It's a small animal that may reach a little over an inch long. Despite its size, it has some impressive abilities. In addition to the blue color, one of the first things that a viewer would notice would probably be the extensions from the animal's body. Each appendage on the body branches into cerata. The cerata are located on the side of the animal instead of on its back. They contain venom and can sting. The animal doesn't produce its venom. It captures nematocysts from jellyfish and uses them itself. As the floating sea slug is transported by wind and water currents, it feeds on creatures that it encounters and stores their nematocysts.

Herman the Sturgeon is so iconic that he's considered the unofficial mascot of Oregon. Herman lives at the Bonneville Fish Hatchery, who built a special holding facility for Herman and his friends called the Sturgeon Viewing and Interpretive Center – it is one of Oregon's most visited tourist attraction. Herman is famous enough to have his own Facebook profile, a line of merchandise, and he recently appeared in a music video by rapper Aesop Rock. Although Herman has lived for eight decades, he has had several brushes with death. Herman has been kidnapped, was severely injured when another group tried to steal him, and he was stabbed multiple times. Fortunately, the viewing center is much safer than the old pond that Herman used to live in at Bonneville and he now spends his days relaxing and enjoying life.

Bigfin (or long arm) squids are a group of rarely seen cephalopods with a distinctive morphology. They are placed in the genus Magnapinna and family Magnapinnidae. Although the family is known only from larval, paralarval, and juvenile specimens, some authorities believe adult specimens have also been seen. Several videos have been taken of animals nicknamed the "long-arm squid", which appear to have a similar morphology. Since none of the seemingly adult specimens has ever been captured or sampled, it remains uncertain if they are of the same genus or only distant relatives.

Martin Strel, a 66-year-old Slovenian known as the "The Fish Man" and "Big River Man," finished a 66 days swim down the Amazon River in 2007, setting the world record for the longest swim. He became the first man to swim the entire length of the famous river from headwaters in Peru to the Brazilian port city of Belém, for a total of 3,274 miles, swimming for more than 10 hours every day, according to Amazon Swim. A decade earlier, Martin Strel became the first man to swim non-stop from Africa to Europe. It took him 29 hours, 36 minutes, and 57 seconds to complete the task. And he did it without a wetsuit, under supervisions and seven international judges. Seven swimmers had tried the same trip before him, but none of them succeeded.

Finless porpoises are named for and distinguished by the absence of a dorsal fin. Instead of this fin, there is a small ridge on their backs that starts just behind their blowhole and extends as far as the tail flukes. Small circular bumps called tubercles cover the ridge. They have unfused neck vertebrae, which enables unrestricted head movement, and they have a small, curving mouth. About half of them have pink eyes. Their streamlined body is blue-gray, though in northern China and Japan adults are light gray.

The trumpetfish can be recognized by its long stick like body with a tubular snout and a chin barbel. Their coloration is variable ranging from yellow, grey and reddish brown. They have the ability to change color to match their surroundings. The dorsal fin is split into two parts, with a set of small spines mid body and a second dorsal fin set back very far above the anal fin which it matches in size. The body shape and configuration of the tail give it a surprisingly fast acceleration from a standstill. They grow up to 80 cm in length. The mouth is very elastic and is opened to create a vacuum to suck in prey. Males have a specialized pouch used to carry the eggs after mating.

Giant otters are the largest of any otter in the world growing up to 1.8m. They are double the size of world's smallest otter, the Asian short-clawed otter. Their most common prey is fish but they have been known to take some of the more feared Amazonian animals such as caiman, anacondas and piranhas!