Why Do Birds Fly South? | A2 ESL Science Reading Passage

Use this A2-B1 ESL science reading passage to learn why birds fly south. It includes key vocabulary, reading comprehension questions, and answers for English learners.

A flock of birds flying south can help learners imagine the idea of migration.

Reading Level

A2-B1

Word Count

286 words

Reading Passage

Every year, when the weather becomes cold, many birds begin a long journey. They leave colder places and fly to warmer areas. This journey is called migration.

Birds do not fly south because they dislike winter. They fly south because winter makes life harder. In cold places, insects disappear, plants stop growing, and seeds or berries can be difficult to find. Many birds need a lot of food each day, so they move to places where food is easier to find.

Birds also follow natural signs. Shorter days, colder air, and changes in food tell them that it is time to travel. They do not need a map or a teacher. Their instinct helps them know when to begin.

Many birds travel in a flock. Flying together can help them stay safe. It can also make the long trip easier. Some birds travel hundreds of miles, while others travel thousands of miles.

One famous migrating bird is the Arctic tern. This small bird can fly from the Arctic to the Antarctic and back again. It makes one of the longest journeys of any bird species.

Bird migration is important for nature. Migrating birds spread seeds, eat insects, and help keep an ecosystem balanced. Their journey is not only amazing. It also helps many parts of the natural world.

Birds often migrate because colder weather makes food harder to find.

Key Vocabulary

Word	Meaning	Example
migration	the movement of animals from one place to another	Bird migration often happens before winter.
instinct	a natural feeling that helps animals know what to do	A bird's instinct can tell it when to travel.
flock	a group of birds	A flock of birds flew across the sky.
species	one type of animal or plant	The Arctic tern is a bird species.
ecosystem	a community of living things and their environment	Birds are an important part of the ecosystem.

Reading Comprehension Questions

1. Why do many birds fly south for winter?
2. What signs tell birds it may be time to migrate?
3. Why can flying in a flock help birds?
4. Which bird is known for a very long migration?
5. How do migrating birds help nature?

Answers

1. They fly south to find warmer places and more food.
2. Shorter days, colder air, and changes in food can tell birds it is time to migrate.
3. Flying in a flock can help birds stay safe and make the trip easier.
4. The Arctic tern is known for a very long migration.
5. Migrating birds spread seeds, eat insects, and help keep ecosystems balanced.

Short Summary

Many birds fly south for winter because cold weather makes food harder to find. Migration helps birds survive and also helps nature stay balanced.

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