Are dolphins on the top of the food chain? I thought they were predated by whales and sharks?
Let's rephrase it to be "pretty much the pinnacle of the food chain".
Turns out, through history, humans were apex predators. We don't live in the ocean; sharks and whales are not preying upon us. In other ecosystems, humans rarely if ever met other apex predators. We were the top of the heap historically in almost every environment we occupied. Pretty much.
That said, I remember reading recently about 6 or 8 human skeletons being found in a saber-toothed tiger den, 80,000 years old, being excavated somewhere.
Now if you mean hominids, no, for most of our history he've been prey. Even for a while after the Homo gender appeared.
> Except for humans (discussed below), dolphins have few natural enemies. Some species or specific populations have none, making them apex predators. For most of the smaller species of dolphins, only a few of the larger sharks, such as the bull shark, dusky shark, tiger shark and great white shark, are a potential risk, especially for calves.[117] Some of the larger dolphin species, especially orcas (killer whales), may also prey on smaller dolphins, but this seems rare.
Thus, the answer to 'Are dolphins on the top of the food chain?' is 'which species of dolphin?'