An image taken from a video posted by Roger Triantafilo shows a dog closing in on his son Jeremy earlier this week. The family's cat fought off the dog after it bit the 4-year-old boy. YouTube hide caption

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Brazil's General Superintendency of Prisons of Alagoas (SGAP) released this photo last Dec. 31 of a cat caught with contraband taped to its body at a medium-security prison in Alagoas state. /AP hide caption

itoggle caption /AP

A Sandhill Crane flies in at sunset to roost for the night in the wetlands of the Monte Vista Wildlife Refuge in Colorado. Migrating along the same route they've followed for thousands of years, about 25,000 Greater Sandhill Cranes pass through the San Luis Valley in late winter every year. Doug Pensinger/Getty Images hide caption

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The genetic factors responsible for a cat's stripes might help researchers understand disease resistance in humans. kennymatic via Flickr hide caption

itoggle caption kennymatic via Flickr

Just dropping in. A frame grab from video of what happened when a cat fell from the ceiling in a Costa Rican classroom. It appeared to be just fine afterward. UPEACE01 hide caption

itoggle caption UPEACE01

Maga Barzallo Sockemtickem, 16, received a bone-marrow transplant at Seattle Children's Hospital in 2011 for leukemia and returned in July 2012 for follow-up treatment. On July 25, an artist at the hospital set up a cat photo installation in her room. Courtesy of Seattle Children's Hospital hide caption

itoggle caption Courtesy of Seattle Children's Hospital

The University of Alabama's players celebrate their No. 8 seeding in the NCAA Men's Basketball Tournament while watching Sunday's selection show in Tuscaloosa. The Crimson Tide, a veteran bunch, will play the upstart mid-major Creighton on Friday. Kent Gidley/AP/University of Alabama hide caption

itoggle caption Kent Gidley/AP/University of Alabama