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Some birds can use artificial objects as tools to get food.
Farmers use fertilizer to help crops grow better in poor soil.
The rainforest has a high level of species diversity.
Some animals change colour to avoid being found by enemies.
Scientists isolate the animal to study its natural behaviour.
Dogs can detect drugs and bombs with their powerful sense of smell.
It is not feasible to keep large wild animals at home.
Vitamin deficiency can cause serious health problems in animals.
Many scientists emphasize the importance of protecting wildlife.
Tests can determine whether the animal has a good memory.
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