Jay Koppelman submitted this shot he caught of a blue heeler in San Miguel de Allende, Mexico to NatGeo.
Sometimes it seems that there are two completely separate worlds that are in existence: that of the humans and the other, which belongs to the animals. In this photo the humans are definitely unaware of all the interaction that goes on in the animal world just feet away. I wonder what's going through this dog's mind.
It was selected as the Photo of the Day at National Geographic, where you can see a larger version. http://photography.nationalgeographic.com/photography/photo-of-the-day/blue-heeler-mexico/?now=2011-07-28-02:01 -Thanks, Marilyn!