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19.03.2020 05:46

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Read the text and put the missing sentences (4-D) in the correct spaces (1-4),
A But recently some scientists have come up with another idea.
B. People used to think pigeons navigated by looking for familiar landmarks
It's almost as if the bird has a built-in compass
D. Some of those feet belonged to dogs.
Mail Carrier
Before trucks, trains and airplanes were invented to move the mail from place to place, messages
had to travel by foot. (1) Dogs were especially popular as message carriers during wars.
The most famous mail carriers have feathers instead of fur - they are carrier pigeons (2) But
sven when scientists blocked pigeons syright by fitting them with frosted contact lenses, the
ons still found their way home
Some people think pigeons use their sense of smell or hearing to guide them. They have
discovered that pigeons heads contain a substance called magnetite. This magnetite may allow the
on to the Earth's magnetic field as a navigation and (4)​