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MODULE Animal Behaviors
6 SCIENCE CONNECTION: Animal Survival ..........................................10

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myNotes 5. The frog myNotes
4. When cold
temperatures come, freezes solid.
Short the frog burrows
FROZEN
Read under leaves. Frozen Alive ................................................................................16
ALIVE
Many animals in North America live in cold
1 1. The frog
regions with harsh winters. There’s no universal starts as an egg.
way to survive the cold. Some animals have warm 6. In warmer
fur. Others burrow into the ground to hibernate. weather, the frog
thaws out!
However, nature gave the wood frog a different—and
stranger—survival plan. It is a survival strategy that
Cells are the building blocks that make up
biologist Sonya Olla describes as “straight out of a 6 all living things. According to Olla, water drains
science fiction movie!” INFORMATIONAL TEXT
liquid that doesn’t freeze and protects the cells
2 Olla has studied wood frogs for five years. She from the frog’s cells. It is replaced with a sugary
says in many ways these frogs are like other from the cold. Then, the space between the
species, or kinds, of frogs. In spring, they start cells freezes, and the frog’s heart stops beating.
their life span as eggs. The eggs soon hatch The frog seems to be frozen solid!
into tadpoles. The tadpoles live in water and
The frog can stay frozen for weeks or
breathe through gills, like fish. 7 months. When the temperature warms, the
The tadpole’s growth is speedy. They soon
3 process reverses. Sugar moves out of the frog’s
grow four legs, and their tails disappear. They cells, and water moves back in. After a while,
also develop lungs so they can breathe on land. 3. The tadpole the frog’s heart starts to beat again. If the
At this point, they’ve become adult frogs. forms legs and temperature changes often, the wood frog can
loses its tail. It is
Then comes winter, and that’s when things get now an adult frog. freeze and thaw many times.
4 2. The egg
strange. “Freezing is deadly to most animals,” Olla hatches into 8 Olla says people often ask why she’s spent so
says. “But for the wood frog, freezing is a good thing.” a tadpole. much time studying a little frog. “It doesn’t look
5 “First, the wood frog burrows under dead leaves,” Olla special,” she says. “But when you examine it
explains. “However, this doesn’t protect it from the cold. closely, you find it’s one of the most remarkable
Something interesting happens in the frog’s cells.” creatures on Earth.”
16 17
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This is Your Life Cycle ............................................................18
myNotes
by Heather Lynn Miller • illustrated by Michael Chesworth
NARRATIVE NONFICTION/FANTASY
Written by Heather Lynn Miller Illustrated by Michael Chesworth
19
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The Nose Awards .................................................................... 48
myNotes
NOSE
INFORMATIONAL TEXT/MAGAZINE ARTICLE
illustrated by
Manu Callejon
49
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Octopus Escapes Again! ....................................................... 58
myNotes
by Laurie Ellen Angus
Written and Illustrated
by Laurie Ellen Angus
NARRATIVE NONFICTION
59
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T.J. The Siberian Tiger Cub ..................................................76
myNotes
By Ann Whitehead Nagda and Cindy Bickel
by Ann Whitehead Nagda • photographed by Cindy Bickel
illustrated by Heather Gatley
INFORMATIONAL TEXT
77
Performance Task
Write a Science Article ...................................................92
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