Predatory animals are those who kill and then eat — in other words, "prey on" — other animals. Hawks, lions, alligators, and human beings are all predatory animals.
Predatory is also used when one party victimizes another for personal gain. For example, businesses are often accused of "predatory practices" when they take advantage of senior citizens, the uneducated, or people who simply don’t understand the specifics of the loan or insurance policy they're signing up for. This is why it’s important to read the fine print of business documents.