The Wide-Headed Shark: teacher key

Hammerhead Sharks, grade 10 edition, written for 10th grade. Hammerhead sharks have wide heads with eyes at the ends. Scalloped hammerheads dive into cold, deep water, and pups, schools and seasonal travel fill their lives.

Read the book. Print this page for the key.

Questions and answers

1. How deep was the deepest dive in the tracking study of scalloped hammerheads?
   • 275 meters
   • 964 meters (answer)
   • 30 meters
2. What did the authors of one tracking study say about the nightly deep diving?
   • Its purpose is unknown (answer)
   • It is for finding a mate
   • It is for staying warm
3. In the western North Atlantic study, where were most great hammerhead depth records?
   • Deeper than 300 meters
   • Shallower than 30 meters (answer)
   • Exactly 100 meters
4. In the 2009 study, which shark's eyes shared the widest arc in front?
   • The bonnethead
   • The scalloped hammerhead
   • The winghead (answer)
5. When do adult male scalloped hammerheads almost exclusively enter schools?
   • When in search of a mate (answer)
   • When diving deep
   • When they are pups
6. What does hypothesized mean in 'has been hypothesized to give it sensory advantages'?
   • Proven beyond doubt
   • Proposed as an idea (answer)
   • Caught in a net

Words

• binocular: using both eyes
• hypothesized: suggested
• nursery: young sharks' home
• solitary: living alone
• nomadic: wandering