Hanging, Standing, Floating: teacher key

How Animals Sleep, grade 4 edition, written for 4th grade. Bats hang, horses stand and whales float straight up and down. See the odd places and ways that animals sleep.

Read the book. Print this page for the key.

Questions and answers

1. What do tendons in a bat's foot let it do?
   • Fly faster
   • Hang while perfectly relaxed (answer)
   • Swim
2. How do sperm whales sleep?
   • Floating straight up and down (answer)
   • On the beach
   • Hanging from rocks
3. Why does a sea otter wrap itself in kelp?
   • To keep warm
   • So it does not drift away while it sleeps (answer)
   • To hide from bats
4. What is odd about a sleeping ostrich?
   • It sleeps underwater
   • It sits still with its eyes open, so it looks alert (answer)
   • It hangs upside down
5. Why would alpine swifts have to sleep in the air, if they sleep at all?
   • They stayed in the air for about 200 days (answer)
   • They are tiny
   • They hang upside down
6. What does upright mean here?
   • Straight up (answer)
   • Upside down
   • Very fast

Words

• tendons: foot cords
• mucus: slimy goo
• kelp: sea plant
• upright: straight up