Lesson 6 Read the world
1 Look at the text quickly. Find the four hyperlinks. What do they do? 2 5.10 Listen and read. How are the animals similar?
Why do some animals migrate? Every year, some animals travel long distances to a new home. These trips are called migrations. They want food, warmer weather or a safe place to have their babies. How do animals know when to migrate? They know from changes in the weather and the amount of daylight or food. Scientists believe animals are born with the instinct to migrate. How do they find their way? Some animals use the sun, the stars and the wind, or natural features such as mountains and rivers. Others, such as birds, use the Earth’s magnetic field.
Which animals are the record breakers? Arctic terns have the longest migration of any animal. Every six months, they fly from the northern Arctic down to Antarctica. It takes 40 days. Then, six months later, they go back to the Arctic. That's about 71,000 km in total!
Monarch butterflies live in the USA and Canada. As it gets colder, they fly south to Mexico, travelling 4,800 km in two months.
The red crab lives on Christmas Island. In the wet season, they move from the forest to the coast to give birth. When the babies are born, the parent crabs travel back to the forest. The trip is 10 km and takes nine days.
The humpback whale has the longest migration of any mammal. They travel 9,800 km from the warmer tropical ocean to find food in the north.
3
Video Watch the video about red crabs.
Video activities
What can you do to help protect different ecosystems around the world?
Science link
60
Read and respond to a web page
Activity Book, p.62
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