* Sharks and killer whales (orcas) *do* eat dolphins, but it's not their only food source. They have a diverse diet that includes fish, seals, and other marine animals.
* Not all sharks eat dolphins. There are many shark species, and only a few are large enough to prey on dolphins. These include great white sharks, bull sharks, tiger sharks, and some other large species.
* Not all sharks "attack anything they see." Sharks are generally not aggressive towards humans. Most shark attacks are caused by mistaken identity or provocation.
* Nurse sharks are not known to prey on dolphins. They are bottom feeders, primarily eating crustaceans and smaller fish.
Here's a more accurate summary:
* Killer whales are apex predators and have a wide diet, including dolphins.
* Some large shark species, like great whites, tiger sharks, and bull sharks, can and do prey on dolphins.
* Most sharks have a diet that does not include dolphins, and they are not generally aggressive towards humans.
It's important to remember that the natural world is complex, and generalizations about animals can be misleading. Always rely on reliable sources for accurate information.