Orcas are sometimes called the "wolves of the sea." They are predators; they prey on other animals for food. Like wolves, they work together in groups. If you're a porpoise or a big fish, you should watch out for an orca. If you're an orca, then you hope that the porpoise or big fish doesn't get away. If it does, then you have to go hungry.
What is the main idea of the paragraph?
A.
Orcas are predators.
B.
Orcas are harmless.
C.
Orcas chase big fish.
D.
Orcas live in groups
