Two Kinds of Nile Crocodile: teacher key

Nile Crocodiles, grade 8 edition, written for 8th grade. Scientists now count two kinds of Nile crocodile. Learn how they live, how they hunt and how mothers guard their nests, and how their numbers have recovered.

Read the book. Print this page for the key.

Questions and answers

1. How many kinds of Nile crocodile do scientists now count?
   • One
   • Two (answer)
   • Five
2. How long may a resting Nile crocodile stay underwater?
   • Up to two minutes
   • Up to two days
   • Up to two hours (answer)
3. What does the IUCN Red List say about the Nile crocodile, as of November 2026?
   • Least Concern (answer)
   • Extinct
   • Almost gone
4. How fast can a Nile crocodile go on land for short distances?
   • About 100 kilometers per hour
   • About 18 kilometers per hour (answer)
   • About 2 kilometers per hour
5. Why might a big crocodile go a long time without food?
   • Its tail stores fat (answer)
   • It eats only at night
   • It sleeps all winter
6. Why do young crocodiles dig tunnels in river banks?
   • To find fish
   • To lay eggs
   • For shelter from predators (answer)

Words

• ambush: hunt from hiding
• predators: hunting animals
• pupils: eye openings
• recover: come back