The first crocodiles  lived on the Earth about 240 million years ago. How much do you know about these dangerous animals? Here are some amazing facts about them. * The biggest crocodile is the saltwater crocodile. It can be as long as seven metres! * If you take a bright light at night over a river with crocodiles inside, you will see pairs of red spots  . Those are the crocodiles' eyes. They can see well at night. * When you see a crocodile with its mouth open, don't be _ . That just tells you it's too hot. * On the beach, crocodiles get tired very quickly, but they can stay in the water for 2-3 hours. * Most crocodiles can live up to 70 years old! Which of the following is right?
Crocodiles often open their mouths when it's hot. Crocodiles can stay on the beach for 2-3 hours. All the crocodiles can live up to 70 years old. The writer talks about four facts about crocodiles.