Fishermen are dangers to sharks because they catch them for their fins. Their fins are used for food and make up.
can be eaten by sharks
Humans...
Box jellyfish, Sharks, Rips and strong waves
Dolphins danger is sharks because they eat the dolphin
Snakes, spiders,sharks (in the sea), geysers
Icebergs, Whirlpools, Thunderstorms, Huge Waves, Sharks.
Pirates fear and dangers are sharks and crocodiles. like in Peter Pan, captain Hook is afraid of the crocodile.
Some of the dangers to seals in the wild are whales, sharks and polar bears. Stevie
VERY high interest rate - the payback amount is likely to escalate without appeal - their collection 'methods' are not friendly.
white sharks and killer whales bald eagles sometimes hunt young sea otters
Some will rest on the bottom and even at the surface (baskings shark) but whether they are truly sleeping we do not know. It is likely they are alert is some manner to avoid predators and other dangers.
You can drown, obviously. But there are also sharks and poisonous fish Sharks! Although more people are killed each year in Hawaii from coconuts falling on their heads than from shark bites, shark attacks just get more media coverage. Also the reason sharks attack surfers, is because the surf boards make the surfers look like seals from the sharks point of view.