Page 131 - DK Children's Encyclopedia

Hibernation SEE ALSO

▸ ▸ Amphibians p.15
▸ ▸ Animal groups
For many animals, finding enough food in winter is hard. p.22
Some animals migrate, or move, to warmer areas. Others ▸ ▸ Day and night
survive by going into a deep sleep, called hibernation. They p.77

wake up again in the springtime when there is more food. ▸ ▸ Mammals p.154
▸ ▸ Migration p.166

▸ ▸ Seasons p.221

Dormouse
These small mammals make Bats hibernate
upside down
cosy nests under leaves on in caves
the forest floor, or at the or trees.
bottom of hedges.

Bat
Bats enter a deep
hibernation. Their
heart rate drops
from 400 to 25
beats per minute.

Dormice can
curl up and sleep
The furry tail
wraps around for up to
the mouse’s face seven months
to keep it warm. in a year.

Wood frog
This frog’s body freezes in Do bears
the winter and its heart hibernate?
stops beating. When the Bears sleep in the winter,
weather gets warmer, its but not very deeply, so
heart starts beating again they can be woken easily.
and the frog thaws out. This is called a torpor. It is
like hibernation, but
without such a deep sleep.

Wood frog
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