Mexican gray wolves at Brookfield Zoo

<div class="meta "><span class="caption-text ">Dr. Carlos Sanchez, an associate veterinarian for the Chicago Zoological Society &#40;pictured standing&#41;, looks at a CT image of a Mexican gray wolf&#39;s head.  (Jim Schulz&#47;Chicago Zoological Society)</span></div>
April 19, 2012 3:04:15 PM PDT