Page 168 - DK Children's Encyclopedia

Migration SEE ALSO

▸ ▸ Birds p.39
▸ ▸ Insects p.134
Some animals make long journeys each year. These ▸ ▸ Mammals p.154
journeys are called migrations. Animals migrate to find ▸ ▸ Metamorphosis
water, to spend winter in warmer places, or to find the p.163

best place to mate and have their babies. ▸ ▸ North America
p.184

▸ ▸ Seasons p.221

Monarch butterfly
Monarch butterflies fly North America
thousands of miles to get
from North America to
Mexico. Butterflies that
arrive in Mexico hatch from
eggs laid by butterflies in Summer
North America. These live Once the caterpillars have
until the spring, when they turned into butterflies,
they are ready to fly farther
can lay eggs on their own. north in large groups, to
mate and lay eggs.
Key Autumn
Autumn As the temperature drops Spring
and there is less food for the The butterflies travel north
Spring butterflies, the young ones to lay their eggs in the warm
begin their long migration spring air, and then die.
south to warmer areas. There will be plenty of
Summer
leaves for the caterpillars
to eat when they hatch.
Mexico

Winter
Huge numbers of Arctic tern
Thousands butterflies come
of butterflies together in the forests These small birds have the
migrate in the winter to rest. longest migration of all
together. animals. They fly back and
forth between the North and
South Pole areas. They fly for
eight months of every year.

Caribou
These hoofed animals
from the Arctic travel in
enormous herds. They
walk up to 30 miles
(50 km) a day for three
months to spend their
summer in open areas
and winter in forests.

166

US_166_Migration.indd 166 16/05/2017 09:49