Here's why:
* Size: Even the largest fish, like whale sharks, are not big enough to swallow a human whole.
* Jaws and Teeth: While some fish have strong jaws and sharp teeth, they are designed for eating prey much smaller than a human.
* Digestive System: A fish's digestive system is not built to handle a large meal like a human.
While there have been rare instances of large sharks attacking humans, they do not typically consume humans in seconds. It's important to remember that sharks are apex predators, but their primary diet consists of smaller sea creatures.