The tiger shark lives in tropical oceans., However, the wale shark isn't dangerous., The tiger shark has markings on its skin., The whale shark has a large mouth and eats plankton., Some seal species are now almost extinct., In addition, hunting and overfishing can cause extinction., For example, the Arabian oryx are nearly extinct., Human activity causes harm to many animal species., Governments and citizens can protect animals., Elephants are naturally gentle animals., African elephants have wrinkled skin., However, African and Asian species are similar in several ways., Normally, bears are not aggressive., However, bears can become dangerous in some situations.,

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