1
.
It's
winter
in
Canada
and
too
cold
for
the
monarch
butterfly
to
feed
and
survive
.
So
it
starts
its
journey
south
,
and
by
the
time
it
arrives
in
Mexico
,
____________________
____________________
____________________
____________________
(
fly
)
more
than
4
,
000
kilometers
(
2
,
485
miles
)
.
2
.
Giant
pandas
almost
exclusively
eat
bamboo
.
At
the
end
of
the
day
,
when
it
finishes
feeding
,
it
____________________
____________________
____________________
(
eat
)
40
pounds
of
bamboo
and
it
____________________
____________________
____________________
____________________
(
forage
)
for
16
hours
.
3
.
These
gray
whales
are
leaving
their
feeding
grounds
in
the
cooler
north
to
breed
in
the
warmer
south
.
When
they
reach
Mexican
waters
,
they
____________________
____________________
____________________
(
swim
)
160
kilometers
(
about
100
miles
)
a
day
for
8
to
10
weeks
.
4
.
After
mating
at
sea
,
female
leatherback
turtles
come
ashore
.
It's
here
that
they
dig
a
hole
,
and
by
the
end
of
the
night
,
they
____________________
____________________
____________________
(
lay
)
80
or
more
eggs
.
5
.
Some
bald
eagle
nests
weigh
more
than
a
ton
.
But
by
the
time
they
reach
this
weight
,
the
bald
eagles
____________________
____________________
____________________
____________________
(
add
)
sticks
to
the
nest
for
several
years
.
6
.
This
female
elephant
is
heavily
pregnant
.
By
the
time
she
is
ready
to
give
birth
,
she
will
____________________
____________________
____________________
the
baby
for
over
22
months
.
