The Nile Crocodile's World: teacher key

Nile Crocodiles, grade 10 edition, written for 10th grade. Nile crocodiles live in the rivers, marshes and swamps of Africa. Read how they sense ripples, hold their breath and hatch from sun-warmed nests.

Read the book. Print this page for the key.

Questions and answers

1. What are some Nile crocodile touch domes tuned to detect?
   • Loud thunder
   • Tiny water ripples (answer)
   • Bright colors
2. What must a crocodile do after strenuous activity?
   • Rest to repay the oxygen debt (answer)
   • Run farther
   • Sleep for a year
3. At 34 degrees Celsius, most Nile crocodile hatchlings are what?
   • Female
   • Turtles
   • Male (answer)
4. Why does a Nile crocodile move between sun and shade?
   • To count each other
   • To dig nests
   • To warm up and cool down (answer)
5. What does a mother Nile crocodile do when her babies are ready to hatch?
   • She digs up the nest (answer)
   • She leaves the river
   • She buries the eggs deeper
6. What does ambush mean on the hunting page?
   • To sing loudly
   • To surprise prey from hiding (answer)
   • To swim far away

Words

• hertz: vibrations per second
• ambush: surprise from hiding
• hatchlings: new babies
• mangrove: coastal tree swamp