The long tentacles trailing from the jellyfish body can inject you with venom from thousands of microscopic barbed stingers. Jellyfish stings vary greatly in severity. Most often they result in immediate pain and red, irritated marks on the skin. Some jellyfish stings may cause more whole-body illness.

Jellyfish can be found in all ocean waters.

Jellyfish tend to just follow the currents of the ocean. This means they can be found around the world in every type of ocean water.

Only pelagic sharks, ones that live in open waters, eat jellyfish. Most jellyfish are small and not a threat to sharks. Sharks will, however, stay away from large species of jellyfish that have a lot of venom. Other common jellyfish predators are the leatherback turtle and ocean sun fish.

Jellyfish can thrive in warm tropical water or cold arctic water. They have been found both at the bottom of the ocean and near the surface.

Jellyfish eyes don’t look or function much like our eyes but they are able to detect basic light signals. Boxed jellyfish are the one exception and have eyes that are able to see and help them avoid obstacles.

Jellyfish are carnivores, but what they eat depends on their size. Smaller jellyfish eat plankton, fish eggs, smaller fish and other tiny creature. Larger jellyfish eat lobsters, shrimp, crabs and fish.

Technically, octopuses don't have any tentacles at all! Instead, they have arms. When you're talking about cephalopods, tentacles tend to be much longer than arms and only have suckers at their "clubbed" ends, whereas arms are shorter, stronger, and suckered all the way down.

The eight tentacles (arms) of octopuses are equipped with one or more rows of sucker like discs, hooks and other adhesive structures that help them ensnare prey.

Recent studies suggest that the suckers on the arms may even be able detect taste!

Unlike human eyes, which focus by changing the shape of the lens, octopus eyes focus by moving the lens. This is similar to the way you would focus a telescope or camera. This gives octopods much better vison.

Fun Fact! Octopus have rectangular pupils.

Favourites on the octopus’ menu include crabs, shrimps and lobsters, but they will sometimes eat larger prey, too, such as sharks. When going for grub, octopuses typically drop down on their prey from above, and then use the powerful suctions that line their arms to pull their victim into their mouth.

Octopuses themselves provide tasty meals for other sea creatures, such as seals, whales and large fish, who like to gobble them up.

There are about 400 species of sharks. The largest being the whale shark which can range in size from 18 to 33 feet and weigh up to 41,000 lbs.!

The smallest shark is the dwarf lanternshark which is only 7.9 inches long and can fit in your hand!

As apex predators, sharks play an important role in the ecosystem by maintaining the species below them in the food chain and serving as an indicator for ocean health. They help remove the weak and the sick as well as keeping the balance with competitors helping to ensure species diversity.

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Sharks are opportunistic feeders, but most sharks primarily feed on smaller fish and invertebrates. Some of the larger shark species prey on seals, sea lions, and other marine mammals.

Sharks do not have bones, they are a special type of fish known as "elasmobranchs", which translates into fish made of cartilaginous tissues.

Sharks have thousands of teeth! Most sharks have 5 rows of teeth, and can have as many as 3000 teeth at once! Shark teeth do not have roots and can break off easily, having multiple rows of teeth ensures that when one falls out another is ready to take its place.

Seahorses are poor swimmers. They rely on their dorsal fin beating at 30-70 times per second to propel it along. Pectoral fins on either side of the head help with stability and steering.

Seahorses eat small crustacean such as Mysis Shrimp. An adult eats 30-50 times a day. Seahorse fry (baby seahorse) eats a staggering 3000 pieces of food per day!

Seahorses have long thin snouts that allow them to probe into nooks and crannies for food. When they find food they suck it up through their snouts like a vacuum cleaner. Their snouts can expand if their prey is larger than the snout.

Seahorses live all over the world in parts of the ocean that aren't too deep or too cold. You can also find them in “estuaries” - places where salty ocean water meets fresh river water. You can find them in seagrass beds, mangrove forests, coral reefs and other shallow coastal habitats.

Seahorses are the only creature where the male carries the young. The female transfers her eggs to the male which he self-fertilizes in his pouch. The number of eggs can vary from 50-150 for smaller species to 1500 for larger species.

They receive everything they need in the pouch from oxygen to food. Gestation time varies from 14 days to 4 weeks. Giving birth can be a long process with contractions lasting up to 12 hours.

The seahorse has a unique muscular tail that is prehensile, meaning it can grip objects much like the way your hand does. Seahorses often wrap their tails around sea grass stems, coral heads, sponges, mangroves, or any other suitable objects when they need to anchor themselves

Seahorses are carnivorous and eat meat!