The reader can tell that the rest of the passage will be about?
It's easy to see why many people cannot tell the difference between alligators and crocodiles. They have similar body types: thick bodies, scary teeth, and long tails. They also stand low to the ground and swim in the water. Some people may think the two animals are exactly the same, but there are a few simple ways to quickly tell if you are looking at an alligator or a crocodile.
the things alligators and crocodiles have in common.
how to take care of your own alligator or crocodile.
what to do if attacked by an alligator or crocodile.
the differences between alligators and crocodiles.