Bobbie's Amazing Journey & Back on Track

Being able to find their way helps animals to _______.

• sleep

• fight

• race

• survive

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

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.

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."

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.

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."

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.

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.