Question

why is the Amazon basin called gigantic zoo

Answer 1

The evergreen forests of the Amazon Basin are called a 'Gigantic Zoo' because they are very rich in wildlife. A variety of birds and insects are also found here. The basin is home of several species of reptiles and snakes like pythons, anacondas as crocodiles as well.
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Answer 2

YOUR ANSWER IS HERE......
THE AMAZON BASIN CALLED GIGANTIC ZOO BECAUSE THEY ARE VERY RICH IN WILDLIFE