Many will say yes, today, that humans are the main cause. (See previous answers, below). There is little doubt that humans are a huge factor in many species’ extinction.
However, tens of millions of species became extinct without any help from humans over geologic time – long before the human species existed.
The first animal that popped up in my mind when I first read this question was the tiger. Many tiger species, such as the Caspian Tiger, have gone extinct due to hunting and poaching.
Here is a GreenAnswers blog article as well as previous GreenAnswers questions dealing with extinct tigers and how they came to be extinct in some way:
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