Buster used to be a lovely dog playing and running on a farm all day. His life had a big change after his handler Will’s presence because Will found he did extremely well in sniffing tests. Will thought Buster had a special talent and decided to let him become a member of RAF police working dogs. Buster began working with Will in 2007, and the pair was sent to Afghanistan’s deadly Helmand province. There, Buster saved countless lives by sniffing out explosive devices (IEDs), as well as weapons. He joined his comrades repeatedly on foot patrols hunting Taliban terrorists and tracking down bombs. He also acted as a useful diplomatic tool, due to his friendly approach to local children. The RAF soon had a long train of children in tow, as Buster drew in his crowd and entertained them.

After his glittering service with the RAF, Buster retired in 2011,and died in 2015 at the age of 13 at the home of his handler, Will, in Lincolnshire where he had been enjoying retirement with his handler Will, his wife Tracy and their two dogs who will inherit (继承) their father’s career.

Over the course of his career, Buster is thought to have saved more than 1,000 lives. He also helped patrol British bases and searched vehicles at check points, and upon retirement was made the official RAF Police mascot (吉祥物). Buster’s brave exploits were even documented in Will’s book, which was published in January and soon became a best-selling one.

Buster completed five tours of duty in Afghanistan, Bosnia and Iraq and earned a row of campaign medals, and it was because of his great efforts in these austere environments full of wars and confrontations that he would be remembered. It was the saving of countless lives by searching out IEDs that saw the honor of official lifetime mascot of the RAF Police bestowed (授予) upon Buster. The RAF police are now planning to commemorate Buster as part of a special event to celebrate RAF Police Working Dogs.

Squirrels eavesdrop on(窃听) the chatter of songbirds to work out whether the appearance of a predator(食肉动物) is cause for alarm, researchers have found. Animals including squirrels have previously been found to eavesdrop on cries of alarm from other creatures. But the latest study suggests animals may also keep an ear out for everyday chitchat among other species as a way to assess whether there is trouble around.

Writing in the journal Plos One, researchers reported on how they made their discovery by observing 67 grey squirrels as they wandered about different areas in the residential regions of Oberlin.

After 30 seconds of observing a squirrel, researchers played it a recording of the call of a red-tailed hawk(鹰), which lasted a couple of seconds-and their behaviour in the next 30 seconds was monitored. The squirrels were then played a three-minute recording of several different species of songbird chattering on a feeder.

The results revealed that in the 30 seconds after hearing the hawk call, the squirrels increased the percentage of their time spent “vigilant”(警惕) compared with before the call, while they also looked up more often to scan the environment. Squirrels that were played bird chatter raised their heads less often during the recording and the number of these “look-ups” dropped off faster over time.

“Recognition of bird chatter as a sign of safety is likely adaptive, as squirrels that can safely reduce their vigilance level in the presence of bird chatter probably are able to increase foraging(觅食) success,” the authors wrote.

The team suggested that with levels of human-made noise increasing, squirrels may find it harder to eavesdrop on birds, meaning they may have to spend more time being alert and less time foraging.

Dr Jakob Bro-Jorgensen, co-author of the study from Oberlin College, said: “The study calls attention to how animals can gather information from their environment by using cues that may at first glance seem irrelevant,” he said. “And it makes you wonder how the more and more pervasive(无处不在的) impact of human activities on natural soundscapes may reduce survival of wildlife in ways we haven’t thought of.”

For many people, moths are dust - colored pests that eat our clothes and disturb us by flying around lights after dark. Not for artist Joseph Scheer. The pictures he creates bring out the beauty of moths, with colors, shapes, and patterns that have never been seen before so clearly. “Digital tools let you see things you'd never see just looking with your eyes,” Scheer says. Scheer's pictures have been displayed around the world, and one reaction is heard everywhere: “People insist, ‘No, that can't be a moth,’” says Scheer.

Scheer's work began with a moth hunt in the state of New York. Scheer would leave the lights on and the windows open overnight at his university office, and then collect the moths that had flown in. When the building cleaners at the university complained, he moved the hunt to his friend Mark Klingensmith's yard. They set up two lights shining over a plastic container on a white sheet. Then moths appeared from the darkness, flew into the sheet, and fell into the plastic container. “We got a different species every night,” Scheer says. “The patterns and colors were unbelievable.”

After the hunt, they used a powerful scanner to get detailed pictures of moths. Small moths presented special challenges.

The scanner records so much information that a single moth can take 20 minutes to scan. A scan of just two small moths fills an entire CD. All that information means the size of the picture can be increased by 2, 700 percent but still keep all the details and appear perfectly clear. You'd need a microscope to see the details shown in Scheer's prints.

Scheer's work is not only a new form of art. He has also made a valuable contribution to the record of the moths around him. He has helped identify more than a thousand different species. “Not from Alaska or the Amazon,” Klingensmith says. “All from one backyard.”