Dolphins before nodding off. That's right, the toughest kids on the undersea block swim in fear of dolphins. Sharks are fish

What is a hippo?
Hippopotamuses are large, semiaquatic mammals native to sub-Saharan Africa. Although their name comes from the Greek for “river horse”—because of the time they spend in the water—their closest living relatives are whales, dolphins, and pigs. They can’t swim, breathe underwater, or even float—but they have developed a tactic that lets them nap underwater. This is well-known for its mythology, which is known as the mythology of animals eating n e h e ng teeth, aggressivethighs, and blood. This is what you know about one of Africa's animals.

Shark
Just like we check under our beds for monsters, sharks check for dolphins before nodding off. That's right, the toughest kids on the undersea block swim in fear of dolphins.
Sharks are fish. They live in water, and use their gills to filter oxygen from the water. Sharks are a special type of fish known because their body is made out of cartilage instead of bones like other fish.
The Pardachirus marmoratus fish (finless sole, Red Sea Moses sole) repels sharks through its secretions. The best-understood factor is pardaxin, acting as an irritant to the sharks' gills, but other chemicals have been identified as contributing to the repellent effect.

Jellyfish

Many types of jellyfish are fairly harmless to humans. Others can cause severe pain and a full-body (systemic) reaction. These jellyfish cause more-serious problems in people: Box jellyfish. Box jellyfish can cause intense pain and, rarely, life-threatening reactions.
While jellyfish stings are painful, most are not emergencies. Expect pain, red marks, itching, numbness, or tingling with a typical sting. But stings from some types of jellyfish — such as the box jellyfish (also called sea wasp) — are very dangerous, and can even be deadly.