Compare the original thesis (not specific and clear enough) with the revised version (much more specific and clear): Original thesis: Although the timber wolf is a timid and gentle animal, it is being systematically exterminated. (if it's so timid and gentle, why is it being exterminated?) Revised thesis: Although the timber wolf is actually a timid and gentle animal, it is being systematically exterminated because people wrongfully believe it to be a fierce and cold_blooded killer.
Does your thesis include a comment about your position on the issue at hand? The thesis statement should do more than merely announce the topic; it must reveal what position you will take in relation to that topic, how you plan to analyze/evaluate the subject or the issue. In short, instead of merely stating a general fact or resorting to a simplistic pro/con statement, you must decide what it is you have to say.
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