One researcher just determined that African and Indian elephants make each other sick. When a new animal or plant is introduced to a habitat bad things happen. The biggest danger to native wildlife is foreign wildlife.
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Dinosaurs are the jumper cables to the human mind. Kids can't curb their enthusiasm when they're in a hall of dinosaurs and mammoths and mammoth hunters and trilobites and giant fish that could chomp up a shark. These natural objects in motion and context make kids want to read; you can't stop them from reading and thinking.