Photo By Robert Henderson Today’s Photo of the Day is “Vigilant Veteran” by Robert Henderson. Location: Lower Zambezi National Park, Zambia. “It was an extremely hot, very dry 42-degree November day in the Lower Zambezi National Park in Zambia,” explains Henderson. “As the sun began to drop in the sky, the lions started to perk up, interact with each other, yawn and look around. This old female had missing teeth, many scars and her canines were quite worn down. But she gave the impression of knowing exactly what she was doing.” Canon 7D Mark II, Canon EF 200-400mm f/4L IS Extender lens at 560mm. Exposure: 1/1600 sec., f/6.3, ISO 1250. Want to get your images in the running for a Photo...