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

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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