Can you clarify what you mean by "main predators"? Are you asking about:
* The apex predator in a particular ecosystem? This would be the animal at the top of the food chain, with no natural predators of its own. Examples include lions in the savanna, or orcas in the ocean.
* The primary predator of a specific species? For example, owls are the primary predator of mice.
* A specific type of predator with a unique hunting style or role? For instance, ambush predators like crocodiles or spiders.
Please give me some more context, and I can help you understand the concept of predators better!