1. Being able to find their way helps animals to ____________.

• sleep
• fight
• race
• survive

2. What are TWO meanings of unravel in the sentence “This is one of the greatest mysteries of the animal world—one that scientists are just beginning to unravel”?

• solve
• confuse
• reveal
• guess

3. How are humans and certain animals able to navigate?

• Both hear very low sounds.
• Both use landmarks.
• Both use the position of the stars.
• Both see invisible patterns in sunlight.

4. Which line from the article supports the correct answer to question 3?

• “Others look to the sky to guide them.”
• “. . . or see patterns in sunlight that are invisible to us.”
• “They can hear sounds that are too low for human ears.”
• “It looks at familiar landmarks . . . to navigate back to its nest.”

5. How do many animals figure out the right direction to follow?

• Scientists train them.
• They travel in groups.
• A giant Earth magnet pulls them.
• Humans guide them.

6. Which line from the article best supports the correct answer to question 5?

• “Scientists now believe that many animals have something inside them that responds to this force.”
• “The force …. Is strongest near the planet’s North and South poles.”
• “They’ll head straight back home….”
• “Experts still aren’t entirely sure how this navigation superpower works.”

7. In “Back On Track,” how do humans help monarch butterflies migrate toward Mexican fir tree forests?

• Scientists change the butterflies’ route.
• People cut down the fir trees.
• People sell the fir trees.
• Groups protect the forests.

8. What is a main idea of both articles?

• Humans always help animals to navigate.
• Animal navigation is a powerful force.
• Humans prevent animal navigation.
• A stray dog traveled a long distance to find his way home.

9. Choose one of the animals discussed in each article. How does this animal use its navigational powers to find its way? Use your RACE strategy.

10. Which of the animal navigational powers discussed in the articles interested you the most? Why? Explain your answer with details from the article.