Following the Hammerhead: teacher key

Hammerhead Sharks, grade 12 edition, written for 12th grade and up. Tags, loggers and computer models show how hammerheads travel, dive and sense prey, while studies disagree about what the wide head is for. Pacific scalloped hammerheads can follow fault lines along the ocean floor.

Read the book. Print this page for the key.

Questions and answers

1. Where did one tagged great hammerhead migrate from and to?
   • From the Bahamas to South Carolina (answer)
   • From Brazil to Australia
   • From Florida to the Bahamas
2. What did the biologgers show about muscle during deep dives?
   • It stayed warm (answer)
   • It grew cold
   • It stopped moving
3. What did the authors of the level-head study say their finding contradicted?
   • The maneuverability hypothesis (answer)
   • That hammerheads live in warm seas
   • That pups are born alive
4. What did the computer simulation conclude about the hammer head?
   • It provides greater maneuverability (answer)
   • It gives no sense of smell
   • It makes the shark slower
5. What can Pacific scalloped hammerheads follow along the ocean floor?
   • Coral walls
   • Geological fault lines (answer)
   • Fishing boats
6. What does suppressing gill function mean?
   • Holding gill function down (answer)
   • Speeding gill function up
   • Moving the gills

Words

• binocular: using both eyes
• simulation: computer model
• lift: an upward push
• electroreceptors: electric sensors
• suppressing: holding down