Eels That Hunt Together: teacher key

Electric Eels, grade 8 edition, written for 8th grade. For a long time scientists thought electric eels hunted alone. Then they found more than 100 together in one lake in Brazil.

Read the book. Print this page for the key.

Questions and answers

1. What did scientists find in a small lake in northern Brazil?
   • More than 100 adult electric eels together (answer)
   • One lonely eel
   • A sunken boat
2. What did groups of eels do to small fish?
   • Herded them into a tight ball (answer)
   • Planted them
   • Painted them
3. Which organ makes the weak pulses?
   • The Sachs organ (answer)
   • The Main organ
   • The Hunter's organ
4. Why did a scientist use DNA on the three kinds of electric eel?
   • They look much alike (answer)
   • They are very big
   • They live in a lake
5. As many as how many pulses a second can an eel send in a burst of shocks?
   • 4
   • 40
   • 400 (answer)
6. What happens when the rainy season comes and the rivers swell?
   • Young eels spread out into new areas (answer)
   • The eels stop breathing air
   • The eels dig nests

Words

• electrocytes: power cells
• doublet: two quick pulses
• current: flow of electricity
• herding: gathering together
• suction: pulling force