occurring once a year
The inspector was back again at the village school for his annual visit.
autumn
the season between summer and winter
For example, the most common pattern in bird migration involves the birds flying north during the spring and flying south during autumn.
available
readily obtainable
Therefore, the birds fly toward the equator and warmer climates, where food is available year-round.
certain
fixed
Have you ever noticed groups of birds flying together during certain times of the year?
cycle
a complete series of occurrences
So, they fly south once more and then repeat the cycle every year!
distance
the amount of space between two points
Nearly two thousand species of birds migrate long distances.
equator
the circle around the earth at an equal distance from North and South Poles
Therefore, the birds fly toward the equator and warmer climates.
migrate
to go from one region to another
Nearly two thousand species of birds migrate long distances.
migration
a number of people or animals moving together in a group
It’s possible the birds are on their annual migration.
moderate
mild or calm
During spring, the birds fly north again to lay their eggs and raise their young in more moderate climates.
north
directed toward the North Pole
For example, the most common pattern in bird migration involves the birds flying north during the spring and flying south during autumn.
possible
may be the case
It’s possible the birds are on their annual migration.
regular
recurring at set times
Bird migration is the regular journey taken by many bird species each year.
south
directed toward the South Pole
For example, the most common pattern in bird migration involves the birds flying north during the spring and flying south during autumn.
toward
in the direction of
Therefore, the birds fly toward the equator and warmer climates, where food is available year-round.
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