The most dangerous predator of sharks are...
...larger sharks!
The shark may also be a prey of killer whales, giant squids and even giant octopus.
Recently it was confirmed, through a night video recording, that the missing small sharks in a big tank of an US aquarium were beeing eaten, during the night, by an octopus that was in the same tank.
Q.E.D.
Post script:
I forget to mention the most obvious enemy of sharks: Homo sapiens sapiens.
enimies of a stingray are the hammer head shark,and humans
sharks, seals, sea lions and large species of carnivorous fish along with humans.
trash in the ocean.
sharks
The enemys of the gods were the titans and those who worked with them
The collective noun for 'stingrays' is a fever of stingrays.
...everything.
his arch enemys are shadow, scourge, dr.eggman, and silver
Crabs are scavengers; they will eat stingrays if the stingrays are already dead.
how stingrays breed: stingrays breed under the sand from:chloe Henderson
You can eat stingrays.
Yes, they aren't the original Stingrays, but they are called Stingrays.
stingrays do not bite they have a stinger in the tale
Are there stingrays in Louisiana? In the gulf of Mexico
No,stingrays are NOT vertebrates.They have cartilage,not bones.
stingrays that aren't poisnous