Life of the Nile Crocodile: teacher key

Nile Crocodiles, grade 12 edition, written for 12th grade and up. The life of a Nile crocodile in Africa's rivers: its size, senses, heart, nests and young, and how its numbers have recovered.

Read the book. Print this page for the key.

Questions and answers

1. What does a crocodile's heart do under water?
   • It works like a three-chambered heart (answer)
   • It stops beating
   • It grows a fifth chamber
2. How long may a resting Nile crocodile stay underwater?
   • Up to two minutes
   • Up to two hours (answer)
   • Up to two days
3. Eggs kept between 28 and 31 degrees Celsius hatch as what?
   • Only males
   • Only females (answer)
   • They never hatch
4. Why might a Nile crocodile move between sun and shade?
   • To warm up and cool down (answer)
   • To count its eggs
   • To find salt
5. What helped Nile crocodile numbers recover?
   • More hunting
   • Laws and protection (answer)
   • Fewer rivers
6. What does ambush mean?
   • Wait hidden, then rush out (answer)
   • Sleep all day
   • Dig a nest

Words

• domes: small raised bumps
• oxygen: gas animals breathe
• ambush: hidden surprise rush
• recover: grow back