Tiger: Pug Marks<br />
           <img src="http://environment.yale.edu/galleries/uploads/09Fall-TigerPrints.jpg" width="462" height="600" alt="Tiger: Pug Marks" style="margin: 4px 0;" ><br />
<p>Tiger biologists almost never see the animals they study, though pug marks the size of grapefruits keep them abundantly alert to the hair-raising presence of tigers.
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<div class="credit"><em>Credit:</em> ©John Goodrich</div>